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Found 15 results

  1. This project is an offshoot of an earlier investigation of wireless wearables using the MSP430G2553: The concept has been successfully tested and is described below. I plan regular updates as the project progresses. The objective is to develop a wearable powered by a coin cell that can be controlled remotely. It could be used, as an example, in the tiara below or on a costume worn by dancers in a performance and controlled from offstage. In the photo an earlier MSP430G2553 coin cell powered wearable is attached to the tiara and driving 3 WS2812 LEDs. The constraints are: cost - unit cost for the receiver of $10 or less technology - common off the shelf components, MSP430G2553 construction - standard double sided PCB spec, keep SMD parts large enough to be hand soldered power - CR2032 (rated 3V and 225 mAH) life - needs to run at least half an hour on fresh batteries reception - 10m with clear line of sight, update at least every 100 ms transmission - desirable but not required size - 40mm/1.6" diameter for receiver programming - Energia desirable schedule - 6 month completion The transmitter will probably be placed on a "Booster Pack" for a LaunchPad running Energia. Multiple LEDs will be driven to gain extra distance, and if required multiple transmitters could be set up from different angles to assure good reception. A display would be helpful as on the FR6989 shown below with an IR LED. The initial Energia transmission sketch to test the concept is located here: The sketch was developed in Energia V17 using a MSP430G2553 LaunchPad and a 940 nm infrared LED. It loops from 0 to 255 and sends a single byte with the count via infrared to the receiver when a button is pushed. The packets for sending bytes do not follow an existing protocol. It is specific to this application and developed with the goal of getting a byte transmitted at least every 100 ms. The receiver will be a custom MSP430G2553 board powered by a coin cell with a TSOP38238 IR receiver. There will LEDs on the PCB and it will also have the capability to drive LEDs off board. The preliminary receiver code was written in C using CCS and direct register access: . The framework for the code is based on a post by RobG here on 43oh. The receiver takes transmissions from the Energia sketch linked above and outputs the current byte on eight LEDs in binary form. When the last byte is received it clears the LEDs and outputs the number of bytes received in error out of the expected 255. This allows analysis of reception at different distances and conditions. Shown below is the preliminary testing setup. In the foreground is the G2553 receiver with a TSOP38238 and output LEDs on a breadboard. Middle ground is a G2553 with the infrared LED sending bytes. Background is output from the receiver being monitored on an oscilloscope. The output of the TSOP38238 is quite clean and no errors were seen with the transmitter and receiver this close together. Transmission is at approximately 1000 bytes per minute or 16+ bytes/sec which is within the desired range. I subsequently modified the test setup to run off batteries so I could do some preliminary distance testing. With clear line of sight reception I saw no errors up to 5 meters with one transmission LED aimed directly at the receiver. Errors crept in after that, especially if the transmission is off to one side, not pointed directly at the receiver, or at a greater distance. Near term activities: increase the number of transmission LEDs evaluate the impact of off-center transmission further test in an environment that doesn't have reflective surfaces add WS2812 driver capability and investigating the impact of TSOP38238 interrupts on the WS2812 driver evaluate 2032 battery life further
  2. I have the CC2650 plug-in module and I am trying understand how to use the BLE library in Energia. I installed the BLE library. The reference page, says that two demo programs are included in Engergia: SerialOverBLE and BLEInputOutput but where exactly are these programs? I would like to download them into Energia and learn about BLE serial communication. -Bob
  3. Hello all! I am currently working on a project that uses two NRF24L01 modules to communicate between two MSP430G2553 chips. The goal is to send a 14 character string of numbers and letters between the two devices. I have been trying to get code working with Code Composer Studio for a few weeks now, but have had no success at all. I found several posts on this forum from others who have tried similar things and this post in particular, with a link to a library created by Spirilis, however I've tried using this library and I can't get any of the code to compile. I suspect that recent changes to CCS and the compilers have rendered the code inoperable. It would be a huge help if someone could point me in the direction of a functional library or any resources that can help me communicate with these wireless modules and transmit/receive data. Thanks in advance!
  4. Hello, I want to make a wireless thermometer using two microcontrollers. How do I write the code in Energia to transmit and receive a variable using a 433 Mhz RF module? Transmitter Setup: I have a TM4C123G connected to a RF transmitter using TX(3) pin 34 on the MCU. The TM4C123G is also connected to a LM34DZ Temp sensor. I need help to modify this working code to send the temperature variable using tx(3) pin 34 /*TM4C123G*/ //initializes/defines the output pin of the LM34 temperature sensor int outputpin= A11; // (pin # 2), use A11 analog input //--------------------------------------------------------------------- //this sets the ground pin to LOW and the input voltage pin to high void setup() { Serial.begin(9600); Serial3.begin(9600); //---------------------------------------------------------------------- } void loop() { int rawvoltage= analogRead(outputpin); float millivolts= (rawvoltage/4095.0) * 3300; float fahrenheit= millivolts/10; Serial3.write(fahrenheit); //transmits temperature to receiver Serial.println(fahrenheit);//displays temperatur on Serial monitor delay(200); } Receiver Setup: I also have a MSP432 connected to a RF receiver using rx pin 3 on the MCU. The MSP432 is connected to a 16x2 LCD. I need help to modify this working code to receive the temperature variable using rx pin 3 and display to the lcd. /*Receiver MSP432*/ #include <LiquidCrystal_I2C.h> #include <Wire.h> #define rfReceivePin 3 //RF Receiver pin = pin 3 unsigned int data = 0; // variable used to store received data byte address = 0x3F; // LCD I2C address int columns = 16; // number of columns on LCD int rows = 2; // number of rows on LCD LiquidCrystal_I2C lcd(address, columns, rows); //----------------------------------------------------------------- void setup() { lcd.init(); // initialize the lcd lcd.backlight(); } //----------------------------------------------------------------- void loop() { lcd.clear(); lcd.setCursor(0,0); data=analogRead(rfReceivePin); //listen for data on pin 3 lcd.print("Temperature"); lcd.setCursor(0,1); lcd.print(data); delay(500); }
  5. Hello! This is my first post, I'm a new board member. I have searched the forum for examples relating to my question and haven't found anything that's quite like what I'm looking for, so here goes. I am trying to build a system where a switch can be flipped on one board and it lights up an LED on another board. I have used the WirelessControl example program to verify that my boards are working and they do. I would like to just modify WirelessControl because it's a relatively simple program and it's already doing what I need the boards to do. The WirelessControl example program requires the pushing of P1.3 in order to light up the red led on the opposite board. What I would like to do is instead of a button needing to be pushed, I'd like to wire up a switch that can just be flipped on. Once the switch is flipped it sends a constant TX signal and lights up the LED on the opposite board. Once the switch is flipped back to off, the corresponding red led should turn off. My question is which pins can I connect a switch to in order to accomplish this. And I would like to wire up a different LED on the other board so that the LED can be installed in a location away from the actual board. Programming questions: how to change the code in WirelessControl to accept a different input as the TX signal and how to configure the program on the other board to light up a different LED in response to RX. Thanks for all your help with this! Current hardware: MSP430 Launchpad with MSP430G2553 Anaren 430Boost-CC110L AIR module BoosterPack
  6. Hello, I think it is a good place to post information about this library I prepared. It is a very simple NRF24L01 library. The library is in C and can be used for any hardware platform with very minimal change. Please feel free to comment and criticize. I tested this using Stellaris Launchpad. Projects using CCS are available in GIT repo. Blog post: Git repo: Thank you!!!
  7. So I recently purchased some "NRF24L01+" boards on eBay. I didn't notice until after the fact that they're chip-on-board and are missing a TON of the components that you typically see on these modules. I found some discussions online about these types of boards - The eBay seller swears that they're genuine NRF24L01+ - but I seriously doubt that - I just need proof. So my question - what's the best way to test these to prove one way or another? I honestly haven't plugged them in - but my first test will probably be some of the Energia examples that @spirillis created and see if anything comes up in a comparison vs the other chips I've got. I'd really like to prove one way or another if they're compatible with my existing NRF24L01+ network. I also noticed there was a recent hackaday post - part of what got me really thinking: You can see the auction here:
  8. Dear colleagues, I'm more than happy to announce the release of panStamp NRG, our new Wireless ISM (868/915 MHz) module based on the CC430F5137 MCU and programmable from the Arduino 1.5 IDE. panStamp NRG is pin, radio and software compatible with our classic AVR modules but entirely relies on a Texas Instruments CC430F5137 MCU instead of our old Atmega + CC1101 approach. As result, we are getting a more robust module providing more features, more speed and consuming less power. Wiki page Commercial website Webstore panStamp NRG can be programmed serially from the Arduino IDE or even wirelessly from our Python tools. All related to panStamp is open source, including hardware designs, cores, libraries and software tools so our users don't need to invest in development toolchains or configuration applications. We also provide sample applications, an open protocol called SWAP and software IP gateway to start deploying WSN (Wireless Sensor Networks) and developing IoT applications from the first day. Another nice feature of NRG is that it can host multiple sensors on-board. There is then no need to develop or buy additional boards for measuring temperature, humidity or 3-axis acceleration since all these sensors can be hosted by this tiny module. Simply grab your application, power the module from a 3V coin battery and display the readings from any of the software applications compatible with panStamp. panStamp NRG is already on sale and we are offering a 15% discount in all our products for the members of the 43oh community until 15 January 2015. You just have to fill your cart and send us an e-mail asking for the discount before completing the payment.
  9. I want to use nRF24l01 RF wireless modules with MSP 430f247 processor. There is a project done on MSP430G2553 with the same wireless module; I want to use USCIB_0 part for communication interface. I replaced output pins in the program. When I debug the program step by step I have seen no signal at SPI line. Do you have any suggestion?
  10. Hi, I am designing a remote controlled system using an arduino uno board and a msp430 launchpad with the ASK RF module (HT12E and HT12D ICs). I am using the msp430 as the transmitter and the arduino uno for the reciever because of requirements of my application. Being familiar with Arduino, i am trying to use energia to program the msp430 with the VirtualWire library. #include <VirtualWire.h> int button = P2_2; int transmit_pin = P2_1; int a,counter=0; char msg[4]; void setup() { vw_set_tx_pin(transmit_pin); vw_setup(2000); // Bits per sec pinMode(button,INPUT); } void loop() { Serial.begin(9600); a=digitalRead(button); itoa(a,msg,10); Serial.println(a); if(a==1) counter=counter+1; vw_send((uint8_t *)msg, strlen(msg)); vw_wait_tx(); Serial.println("success"); delay(1000); } This code, when used on the arduino, compiles, uploads and executes succesfully. The transmitter board LED blinks to indicate successful transmission of data. But when i use it on energia, there is an error- any suggestions to get through with this error. Or if the same code can be implemented using another library. Cheers!
  11. can we interface ADC chip directly to our PC..I am targeting for LabVIEW software in PC.I want to design oscilloscope without using any controller hardware...??Also suggest me ADC chip which has wireless UART
  12. I am currently playing with a nifty little module from Anaren called AIR (2pg pdf:, for a low-power embedded project and it works OK; but I was wondering if anyone else had experience with any other like type modules? My loose requirements are that I would like to reasonably (not pie-in-the-sky) hit 1/4 - 1/2 mile distances at slow speeds (9600 baud is fine). I would like to use an omni antenna (so no high directional antennas), would prefer the module to have pre-FCC approval, and would like the modules to be less than $15. Lower the power draw the better, but we know how that trade-off works! Those requirements really limit me, but the Anaren part seems like it could cover them; I am just curious what other things are out there that I might have missed. I am not married to the 900MHz spectrum, it just seemed like the most likely place for me to meet my goals. This is for an outdoor transmission.
  13. I've built a wireless temperature monitor with the following features: Very low-power (7uA) sleep mode Dual 1-wire dallas temperature sensor inputs, to measure two temperature sensors at the same time. A 2-line LCD display that displays the current measurement for 15 seconds when a button is pushed. 2xAA battery supply, with charge pump to power the LCD, temperature sensors and 433Mhz wireless module. Uses VirtualWire to transmit the data to an MSP430-powered receiver module. This is all currently sitting outside, and the indoor rx unit is uploading the measured temperatures as well as the battery voltage to Cosm. I've attached to this post the eagle files for the outdoor unit, and the veroboard layout for the same. I'll upload some photos also, and details of the indoor unit and the python script that uploads the data to cosm. The indoor unit is currently sitting on a breadboard, not in a nice project box, but its time will come I've hacked the VirtualWire library to bits, leaving only the transmitting portion of the code. This was so that I could understand it, and so that I could have it running at a lower timer speed for (very slightly) lower power. There's a few things in the schematic that might not really be necessary. I've used two fets to switch off the radio and the lcd/sensor separately, because I was under the impression that the radio transmitted the whole time while powered on. I now realise that it only transmits when the data pin is high, so I could have saved myself a component there. Also I'm using a whole hex level shifter IC just for the one input into the radio, because the other shifter's lines are all used up by the LCD. This also isn't necessary, since a singe fet would have done the job if I'd inverted the output of VirtualWire in software. But in any case, it all works, and seems (so far) fairly reliable. There are some spurious readings that I accidentally uploaded to cosm while working on the receiver end, but other than that I'm pretty happy. What I'm really quite interested in is how the battery voltage is going to change over the coming few years. Please feel free to use any of the code that I've uploaded, but be aware that in the words of some other forum poster somewhere, it's not supposed to be pretty - it's just supposed to work! -dave
  14. I have been working on a few different projects that could be described as wireless sensor nodes. Just to get something working I decided to hack a retail router to give my MSP430 wireless capabilities. The first step was to install OpenWRT Linux onto the router to make it configurable. After that I mounted the file system onto a flash drive that was using the built in USB port on the router. From there I broke out the convenient 3.3v serial connection and hooked it up to my MSP430. Currently I am working on a full write up that will include compiling OpenWRT from source and detailed step by step instructions to install all the needed packages. I am also finishing up some scripts that should automate the hard stuff and give your launchpad a wireless connection in no time. Decided I would add some some pictures and examples for everyone to look at while I finish the write up / automation scripts. This is by no means a finished or polished project. Here is a link to the Imgur album with short descriptions. And here is a video of me using the wireless capabilities to trigger a relay. I will update this post when I finish everything else.
  15. The ENC28J60 Booster Pack thread has got several posts that venture into wireless networking and internet of things. I thought it might make sense to bring these discussion to their own thread. The topic title might not be spot on, but it's fuzzy enough to cover almost everything :-) Please add your ideas and comments to this thread (maybe even re-post ideas from the ECN28J60 Booster Pack thread). I am currently playing around with a couple of CC2500 modules, which I am going to use for a small sensor network at home. Sensors could be anything such as temperature, humidity and motion sensors. I designed a simple protocol, which allows battery operated devices to turn off the radio-device for a prolonged period. Currently, I have a prototype setup consisting of 3 temperature sensors connected to MSP430 Launchpads, and a Stellaris Launchpad that collects measurements and submits them to a web-service. A 3v 250mAh battery is able to run a MSP430 launchpad for over a week with measurements being performed every 5 minutes. Now I am considering implementing the MAC layer (or parts of it) of IEEE 802.15.4 (low-rate wireless personal area networks, LR-WPANs). CC2550 will never be able to adhere the IEEE 802.15.4 specification, due to incompatible physical layer, but as I'm not really interested in compatibility this isn't a problem for me.