ESP32 Forum

Hi Everyone.

We are working on a radar level sensor. What we especially want is to use the Bluetooth feature. However, we will wake up the esp, take measurements and put it back to sleep. We aim to keep the current drawn at this measurement moment low. (Deep sleep current is also important, but the current at the time of measurement is also in our hands. Which product of yours would you recommend that can draw the least current at this moment of operation?

If you only take the measurement to accumulate them to later send as a batch, any chip with a low-power coprocessor may be able to do that; that CPU tends to use a fraction of what the main chip uses. I'd suggest the ESP32-C6 in particular for that as we improved the low-power coprocessor by a lot in that chip. If you also need to send each measurement over BTLE, the choice becomes a bit more muddied; you could also use an ESP32-C3 or even ESP32-S3 in that case. If you need BT Classic, the 'original' ESP32 is your only choice.

Communication with the sensor will be via 4-20 mA. Bluetooth will only be used for adjustments. Normally, Nordic is used in these structures. I want to work with Esp here.