linux-works
DIY: lipoly battery charger with bluetooth and sd-card data logging
The next step in evolving this project; adding local data-logging via standard micro-sd cards (see the adafruit breakout board next to the battery).
For remote control, there is serial 'TTL' (3.3v levels) over bluetooth using the standard SPP profile, aka, 'remote serial terminal'. I'm using software-serial on the arduino nano to talk 9600 TTL to the HC-05 bluetooth module (BT classic, not BLE). Currently, I have only a simple CLI as the management interface.
The board shown, here, is the headless charger board. It is not meant to have much (if any) display. There is a reason for that, which I'll talk about in a future posting ;)
Along side this board is a matching dongle cable that I built up. Top module is a usb to TTL serial, cp2102 for under $10 on ebay/amazon/etc. Bottom module is the same exact, 100% exact module as the one on the charger board; but one is configured as master and one as slave. It actually does not matter which is which, since they now form a peering or 'pairing' as the BT guys like to say ;) Sadly, I could not configure these with names or hard-configured link addrs; the only things I could do to make these a pair (automatically) is to set their passcodes to be the same, and non-factory default (which is 1234; the same that I have on my airline luggage, doh!)
DIY: lipoly battery charger with bluetooth and sd-card data logging
The next step in evolving this project; adding local data-logging via standard micro-sd cards (see the adafruit breakout board next to the battery).
For remote control, there is serial 'TTL' (3.3v levels) over bluetooth using the standard SPP profile, aka, 'remote serial terminal'. I'm using software-serial on the arduino nano to talk 9600 TTL to the HC-05 bluetooth module (BT classic, not BLE). Currently, I have only a simple CLI as the management interface.
The board shown, here, is the headless charger board. It is not meant to have much (if any) display. There is a reason for that, which I'll talk about in a future posting ;)
Along side this board is a matching dongle cable that I built up. Top module is a usb to TTL serial, cp2102 for under $10 on ebay/amazon/etc. Bottom module is the same exact, 100% exact module as the one on the charger board; but one is configured as master and one as slave. It actually does not matter which is which, since they now form a peering or 'pairing' as the BT guys like to say ;) Sadly, I could not configure these with names or hard-configured link addrs; the only things I could do to make these a pair (automatically) is to set their passcodes to be the same, and non-factory default (which is 1234; the same that I have on my airline luggage, doh!)