Binary msg box with a MSP430G2101 on LPM4

[rivalslayer 0]

I was wondering what I could do with all the low-power I got and I decided I can make a pretty small message box, which will display a message with the press of a button. This time, it's only a message in Binary ASCII form.

 

I used a TicTac Lozenge box and made a small home brew through hole PCB, and powered it with a CR2032. I used the MSP430G2101 micro, as that was all I needed. I went up to LPM4 mode, to save a lot of power, and ran the whole application through timers and interrupts. I hope this thing will run for a few months on a single battery. (It never turns off, it just displays the message and sleeps again)

 

Problem was the footprint of MSP430G2101 in EAGLE. It was not really up to the size of the real device (I got it from the internet, I forgot where). Had to improvise. Will be making a new footprint. This project is the first one where I made a PCB footprint (for the CR2032 battery holder) myself.

 

Here is the thing...

[simpleavr 399]

nice project, thanks for sharing.

 

i had a project also uses LPM4 and wakes up only from two external interrupts. are u sure u are on LPM4? my understanding is that all clocks are stopped and it's just ram retention left. how do u wake up?

 

my project is on a G2211 along w/ a sleeping rtc (nxp pcf8563) and measured 70uA while sleep. from the datasheets i would expect a few uAs. i never tweak the code to further reduce it as less than 100uA to me is low. if u got a chance to measure your power consumption it would be good to know (and compare).

[bluehash 1,581]

Thanks for sharing this rivalslayer. This would sharpen anyone's binary skills.

 

Moving to Projects section..

[bluehash 1,581]

Problem was the footprint of MSP430G2101 in EAGLE. It was not really up to the size of the real device (I got it from the internet, I forgot where). Had to improvise. Will be making a new footprint. This project is the first one where I made a PCB footprint (for the CR2032 battery holder) myself.

 

I dont have eagle at work. Enrico had mailed me over a month back with his MSP430 Value Line Series Eagle Library. I've yet to publish it.

 

I'm unsure if it does have footprints, but you could check and report back. Attaching here as a backup.

msp430g2xx.rar

[GeekDoc 226]

I'm unsure if it does have footprints, but you could check and report back.

It's just the one part (14-pin DIP), but it does have pin designations and footprint. Thanks for sharing!

[rivalslayer 0]

@simpleavr I used external interrupt, with a button. It did the trick.

 

@bluehash Thanks a lot! I have this footprint only and I am afraid the width of the real device is greater than the footprint. Have to modify is a bit.

 

@GeekDoc Ya I know, but the width was not really correct there...

 

BTW, This is my smallest PCB.

[rivalslayer 0]

@bluehash, thanks a lot for moving it to apt section. I really didn't notice a project section. I would post it there. Sorry.

[GeekDoc 226]

@GeekDoc Ya I know, but the width was not really correct there...

Hmmm... Didn't really check the size. *prints out footprint* *compares to part* Yep! I thought it looked a little narrow! It's a full 0.1" too narrow. (The pads are pretty small, too.)

 

I've just used the generic DIP-14 part for the 14-pin MSP430s in the past; they work fine (no pin labels, though). Maybe I'll set up a part and post it...

[bluehash 1,581]

Your welcome.

RivalSlayer or GeekDoc, If any of you guys are using it, could you correct it and submit as a new thread in the General section.

If not, then no worries..

[rivalslayer 0]

bluehash,

 

I definitely will fix it. I will upload it as soon as I fix it.

 

[GeekDoc 226]

I definitely will fix it. I will upload it as soon as I fix it.

juani_c posted a complete and accurate one in the other thread: here. (Ignore my mis-corrections, his library is accurate to begin with. :oops: )