![]() ![]() Setting it up was surprisingly painless – blow a new 16Gb SD card with Raspbian, connect screen to the 5V and 0V on the GPIO and the ribbon cable to DSI. Also to stop FLdigi getting hopelessly confused on my main PC – with two sound cards already adding a third sound card as interface for the radio meant portaudio, whatever that is, gets hopelessly confused on Windows and loses touch with the hardware intermittently. The aim of this is to be able to run FLdigi and WSJT-X 1 in a portable setup. I got a new Raspberry Pi v4 and the official touchscreen. Continue reading “Running a Raspberry Pi off a LiPo battery” Author richard Posted on SeptemCategories Raspberry Pi Leave a comment on Running a Raspberry Pi off a LiPo battery Raspberry Pi 4 with touchscreen and FLdigi The PiZero (not W, mine is a 1.3) draws about 30-40mA powered down, that’s much better than a real Pi but still a bit much for a battery. Some Pis have a setting where you can pull a wire to ground to start the board fortunately the DS3231 pin3 is open-drain so ti will work with that. That will pull down Pin 3 on the alarm, although pin 3 isn’t brought out on the connector it’s easy enough to tack a wire onto that. It turns out the stock Raspberry Pi driver can support one single wakeup alarm on the DS3231 – the gory details are here. I then considered using a 16F628A PIC with one of the DS3231 dongles, a Chinese noname clone of this. ![]() This is where I wanted to be: Pi running off a batteryĪnd at first considered a 5V LiPo plus RTC device like this only to discover it won’t start the Pi on a schedule. So I need a real-time clock, and all of a sudden a simple requirement has turned into dongle hell. In this case I favoured the piZero variant, and didn’t have aims to be connected to t’internet in the field. ![]() I’ve used a wide input shim to power Pi’s off a CCTV power supply rather than have one mains PSU per Pi. There are no end of shims and gizmos that will up the 3.7 to 3.2V of a LiPo battery to 5V, for putting into the Pi. Why keep a dog if you have to bark yourself? I am night owl □ I don’t do dawn, if I can help it, and since the target is static in my case, and the Raspberry Pi is the camera of choice, it seems a nice idea to get the Pi to do all the work of getting up early. IR photos are easy enough these days, you can either butcher the camera you already have taking out the IR filter, or you can use a Raspberry Pi NoIR camera where they have taken the filter out/not fitted it at the factory. ![]()
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