tnts wrote:install this fona basic project that is in a tutorial / library and push every half an hour
That sounds safer than using a multimeter.
If we are working on the same project (the TYOS piphone) then u may find this interesting. I had shapeways print the 3D case in the instructables comments for the RPI 3 and it has a separate compartment for a cylindrical battery. It was made for the wider 26650 battery without a battery holder, but I want to put a battery holder in there (I think it's safer) and the 18650 should work but I'll know in a couple days.
I've decided to put the RPI A+ in there as the openings for HDMI, micro USB, and audio jack are the same but the A+ board is shorter. The A+ will sip on this battery with the fona and should give me at least a day. I'm also gonna run this as a hotspot rather than a phone...but it could do both. Here's what it looks like with the RPI 3:
encased-front-scaled.jpg (128.76 KiB) Viewed 554 times
looks very nice - I will be working on enclosure for my toy later :)
In my case its a tracker device, but I am looking for maximum lifetime on battery.
I am just in the middle of experiment with my battery. Looks like I will have to remove all leds (I count each led 20-30mA... way too much).
I want to put 1 or 2 LEDs in mine also. I haven't thought too much about it but I was thinking a power LED for the entire phone and an LED for the fona...I'm not sure what that'll be. Adafruit has a nice command where u can switch off the TFT lights also. I made 2 scripts-one on and one off-and want to have a simple push button that will control this.
probably you have rasp.pi not arduino. If you will have problems with compiling something with this library then just look in the code...
there is this: AT+CBC
whatever you will do - double, triple check the battery polarity - if reversed then it will fry the charger (i know - i did it - that's why I know the charger part - had to replace this part)
I think I already did that with an Adafruit JST extension cable. The wires were the same color on both sides but maybe that connector crossed things. All I know for sure is that it powered on like normal one time, but when I shut down and restarted-no power lights.
I started another thread with a link to the thread I read here about resetting the FONA. I bought another but may have a backup if I can get the first one working again. Here's the link to my post where I put the other link: