Actually, today's blog article should cover the topic of supercapacitors, due to a... unplanned spraying"... In the electronics lab we temporarily postpone this contribution today show only the inductive power supply of microcontrollers. This made today's contribution a little shorter:
The inductive transmission of electricity to devices is a long-known principle. Electric toothbrushes have been charged like this for decades now. Today we want to answer the question of whether, in practice, a microcontroller can be operated so reliably.
Since the electronic requirements for the inductive landing of terminal equipment have changed significantly in recent years, the QI standard has already been created in 2009. Due to the resonant inductive coupling of the coils, a relatively high power can now be transmitted without exceeding the permissible EMV limits. Other newer standards (Powermat/AirFuel) also apply this principle. As this is a relatively complex process involving data exchange
In order to test whether this type of energy transmission is suitable for our needs, we used an ESP32 with OLED and LoRa and played the "Factory Test". A connection with an existing WLAN is created and then the available networks are displayed at the Oled. As a second task, the controller sends data packets using LoRa modem and we check the receipt on a second copy.
Thus, it can be determined whether the inductive "loading" causes problems with the microcontroller itself, when receiving WLAN packages or on 433Mhz.
We have used the following hardware for this experiment:
- Heltec Factory Test WIFI Kit 32-LoRa
All WLANs in range are correctly displayed, even in longer operation the ESP32 does not come out of the step and the range of LoRa transmissions has not decreased.
With this contribution I hope to inspire some customers and say goodbye until next time:)