Hello,
I'd like to setup a remote raspberry pi picaxe combination, all battery powered. The raspberry pi zero wireless would be used to program the picaxe and to collect data from picaxe. I'd like to have everything run on a single LiPo cell with a 3.3V LDO regulator. To conserve power pi would be powered off most of the time, done through the WiFi with the sudo poweroff command. To bring the pi power back on I'd like to use a picaxe with a 315 Mhz radio link. What would be the best way to power it on? I tried a power NPN transistor and the voltage loss is around .5V so that might be too much, maybe place the 3.3V regulator after the transistor.. I think the best solution would be a latching relay but I'm open to suggestions. Perhaps a mosfet that works at lower voltages, I've only used 5 volt mosfets and am not aware of lower voltage types. I looked at the pi GPIO pins and don't see any enable pins or way to power up using logic levels.
I'd like to setup a remote raspberry pi picaxe combination, all battery powered. The raspberry pi zero wireless would be used to program the picaxe and to collect data from picaxe. I'd like to have everything run on a single LiPo cell with a 3.3V LDO regulator. To conserve power pi would be powered off most of the time, done through the WiFi with the sudo poweroff command. To bring the pi power back on I'd like to use a picaxe with a 315 Mhz radio link. What would be the best way to power it on? I tried a power NPN transistor and the voltage loss is around .5V so that might be too much, maybe place the 3.3V regulator after the transistor.. I think the best solution would be a latching relay but I'm open to suggestions. Perhaps a mosfet that works at lower voltages, I've only used 5 volt mosfets and am not aware of lower voltage types. I looked at the pi GPIO pins and don't see any enable pins or way to power up using logic levels.