Power management

Owned by James Hughes
Last updated: Sept 09, 2021 by Thomas Krebs
1 min read

ESP32 Integration

We are integrating the ESP32 onto the PCB directly and removing the devkit. We cannot get low currents without it.

Load Switch Evaluation

Mode

Icc measured

 

Mode

Icc measured

 

Deep sleep only

10,4mA

 

Deep sleep with Wifi stop

197µA

 

Deep sleep with WiFi stop and accessory power off

104µA

 

Deep sleep with WiFi stop, accessory power off and EEPROM

271µA

 

Deep sleep with WiFi stop, accessory power off, activated EEPROM, deactivated GPIO33 in deep sleep

250µA

 

 

Sensor Management

Sensor

Supply

Comments

Sensor

Supply

Comments

DS18B20

3V3_ACC

 

Rain tip

3V3

WAKE_EVENT driven

Wind Speed

3V3

 

Wind Direction

3V3_ACC

 

3 x I²C-Port

3V3

 

3 x I²C-Port

3V3_ACC

 

Photo resistor

3V3_ACC

 

 

 

 

 

 

 

**We need to consider a debounce circuit or an external I2C counter chip for wind evaluation. For now, I prefer to use a time slice based approach. We can WAKE periodically to take wind evaluation data without powering up the WiFi radio.