kenemon

where do the batteries go?

I am willing to share some of these boards if anyone wants....

Finally got the boards in from China. These ones worked out nice, and most of the intentions are a success. There are a couple of errors, ie. the LED pin doesn't line up, but otherwise I have a slight chubby. I am still figuring out how to deal with the expansion potential of these, I was even thinking of stackable daisy chained devices which is possible with the layout. Of course, first, I need to reflow and do some more connections. I have two versions.....

Had a minute and the camera at hand today.....

Finally managed to get the 2-axis light sensor together..... Next step wire up MOSFETs and LP for signal processing

I figured out a way to do it. By adding another LED with opposite polarity to the first, I was able to get the inhibition I need. I have created a 2 axis sensor array which is very sensitive using cheap 2N7000's and 12 LED's. These should shoot the appropriate signal to the MCU so I can do some processing. I will post some pics when I get a little more put together.....

Hi Guys, anyone know how to speed up the decay time on a MOSFET. I have a simple sensor circuit which uses LED as photosensor and serves to trip the MOSFET. When I shield it from the light it returns to the "off" state, but it sure takes its time. is there a simple way to do this? Thanks. KB

I think shutting them all off would cause more peaceful confusion :thumbup:

I used designspark. When I inquired about the spans, they reported .89 and 2.63mm where I measure 1.00 and 2.5mm on my design. You would think that a rounding error would have been considered by the programmer way in the beginning.... update: when I started a discourse with Seeed they were as helpful as humanly possible. Unfortunately, it was my fault ($ :cry: $), It appears I was using mil ruler at the start and something was lost in translation. The design matched my numbers, but gerber files had inappropriate scaling.

I used designspark. When I inquired about the spans, they reported .89 and 2.63mm where I measure 1.00 and 2.5mm on my design. You would think that a rounding error would have been considered by the programmer way in the beginning....

Thanks Zeke, I appreciate the support. I will definitely let you know next time before i leap. I have been putting off the caliper, but I am sure it will save in the long run. KB

I finally got the boards. They appeared beautiful, and i received two extra. I immediately noticed that the spacing was off for the module. I verified my Gerbers, and tried to make it work anyhow. Managed to fry a hell of a nice module due to my frustration. It seems like something happened in translation. When I checked the spacing with some standard .1in headers, they also had some drift. I contacted LSR, and they proclaim the footprint is correct. I feel bad that I failed on this one. I am going to try to rework the board, and get a new mod when I stop crying. I think if I mak

Looks great, I am still waiting on mine from seeed studio. Have you been able to access the module? Got any to spare while I wait for the others?

I love this idea. It would be a great module for allot of sensor projects. It would be great to integrate some extra RAM, or wireless to offload the memory to a bigger location. I saw a hack on a while back that utilized old memory cards in a very simple way. I couldn't find post readily, but I found this http://elasticsheep.com/2010/01/reading-an-sd-card-with-an-atmega168/. How about a wireless ECG recorder which could send data to the watch and upload when proximal to a BT node? KB

when I went to register the wanted my CC and $25 to complete it.....

"In Production" as of 9.9 :thumbup:

Hey those look pretty cool. I have some basic PCB boards to break out:http://www.lsr.com/products/radio_modules/802.11_BGN_BT/tiwi-r2.aspx They were shipped already. If they work I should have an extra...

I would like to go to the one in Chicago on Thursday. $25 for a free watch though :roll: . Anybody with a discount code for registration?

thanks blue, thats what i have been lookn for... KB

I could be wrong, but the reason to use the ADC is to get a reliable estimate of the strength of the signal being generated by the sensor. This would mean, the higher the light level, the greater the adcval, and vice versa. I dont think this could be achieved in such a simplistic way, using digital inputs. Thanks. KB

thanks user. I already have had some luck using your code. I am using it as a simple photo detector- in hopes of making a differential light detector. I cannot however get the code to work with 2 sensors. Any ideas. I tried posting this in the code section, but I havent got much feedback yet :cry: thanks. /* LED as Photo-Sensor2 / KB, interpreted from: Gustavo J. Fiorenza */ #include "msp430g2452.h" // Change the header to "msp430x20x2.h" if you're using the default MCU bundled with the LaunchPad. #define LED_SENSEL INCH_0 // Left sensor #define LED_SENSER INCH_3 // Righ

thanks for the reply blue. I want to compare the L & R sensors ultimately. Here I am trying to use INCH_0 and INCH_1 simultaneously so that I can compare adcvalL and adcvalR. I cant get both inputs to register, one at time is fine. I think it is an issue with my ADC configuration. Thanks. KB

Hi All, trying to make a photo sensor, I came across this nice example. Simple, and it works well! http://gushh.net/blog/msp430-launchpad-led-as-photodiode/ When I improvise with his code a little, I am running into some strange problems. Can anyone see any obvious errors I have made, my exp with the ADC is surely lacking. You input is welcome :thumbup: #include "msp430g2452.h" // #define LED_SENSEL INCH_0 // LED sensor L #define LED_SENSER INCH_1 //LED sensor R unsigned int adcvalL = 0; unsigned int adcvalR = 0; unsigned int analogRead(unsigned int pin) { ADC10C

Hi username, could you please post some info circuitry or schematic. I am interested in the amplifier for the sensor and your use of the ADC, but am stuck in the conceptual phase. thanks. KB