4 ms·
One option is to use 3.7v lipos[0] with a regulator[1], which can be done pretty cheaply: [0] https://www.aliexpress.com/item/10pcs-3-7V-260mAh-Lipo-Battery-wi
by egwynn 9y ago
One option is to use 3.7v lipos[0] with a regulator[1], which can be done pretty cheaply:
[0] https://www.aliexpress.com/item/10pcs-3-7V-260mAh-Lipo-Battery-with-X5-5in1-green-Charger-for-JJRC-H8-Mini-Eachine/32795774607.html https://www.aliexpress.com/item/10pcs-3-7V-260mAh-Lipo-Batte...
[1] https://www.aliexpress.com/item/5pcs-Ultra-mini-DC-3-7V-4-5V-5V-to-3-3V-DC-DC-Step-Down/32653810603.html https://www.aliexpress.com/item/5pcs-Ultra-mini-DC-3-7V-4-5V...
- rcarmo 9y agoFunny that I buy those exact same LiPos for my quadcopters, and never considered using them for an ESP8266. How much time do you get out of those if you're using a DHT22 sensor?
- egwynn 9y agoFunny enough, a battery-powered DHT22 is my next project, so I don’t know yet! But in my other experience the expensive part is powering on the radio, which spikes to 200-300mA at startup and then will sustain around 80mA as long as it’s on.
- rcarmo 9y agoWell, I'm running a test with 2xAA batteries. With a modified version of https://github.com/rcarmo/azure-iot-esp-01-minimal-cpp https://github.com/rcarmo/azure-iot-esp-01-minimal-cpp that only wakes up every 15m to send a single multicast packet and the power LED removed, the battery's still at 3.08V after two months :)