3 ms·
Coin cells are not an option- it consumes around 200-300mA while actively transmitting, and around 10uA in (one of) sleep modes. I'm powering my custom temperat
by fest 9y ago
Coin cells are not an option- it consumes around 200-300mA while actively transmitting, and around 10uA in (one of) sleep modes. I'm powering my custom temperature/humidity sensors with 18650 lithium batteries. I'm getting around 3-4 months of battery life with 3000mA batteries (waking up every 15 minutes to make a reading, associate with AP and transmit data to local influxdb server (which also runs Home Assistant to see the readings and control some AC outlets).
- bilkow 9y agoIt may be an option if using (super)capacitors and only transmitting / receiving for a short fraction of time. https://hackaday.io/project/28527-solved-esp8266-powered-by-coin-cell https://hackaday.io/project/28527-solved-esp8266-powered-by-...
- Kelbit 9y agoDo make sure to check the leakage specs on a supercap, though. They tend to have pretty high leakage current, which may clobber your power budget in low duty cycle applications.
- fest 9y agoI stand corrected. By combining that with low-leakage wakeup timer ICs and low-leakage supercap, one could indeed design a device that runs for months on a single coin cell (transmitting every few hours).
- paulie_a 9y agoIs your project open source. I've been wanting to build that exact sensor network for a hunidor
- fest 9y agoIt is now: https://github.com/festlv/esp32-temperature-humidity-sensor https://github.com/festlv/esp32-temperature-humidity-sensor