Inductive power supply of microcontrollers

Hello everyone,

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:

Use software:

  • Heltec Factory Test WIFI Kit 32-LoRa

The structure:

 

Result:

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:)

Moritz.

DisplaysEsp-32Projekte für anfänger

6 comments

Michael

Michael

Nicola Tesla hat das schon vor mehr als 100 Jahren gewusst. :-)

Terno

Terno

Heute ist doch erst der 2 Maerz !! Nichht der 1, April

Friedhelm

Friedhelm

Warum haben Sie die Hardware nicht bekannt gegeben? Oder habe ich etwas übersehen?

C. Dirks

C. Dirks

Hallo Moritz,
Die Leistungen von Empfänger zu Sender stehen in welchem Verhältnis zueinander? Auch die Werte der Spannungen und Ströme interessiert mich.
Danke.
Ich finde das Projekt sehr spannend. :-)

Reiner

Reiner

Wie verhält es sich mit dem Abstand zwischen Ladematte und Emofänger ? Geht es noch wenn eine Isolierfensterscheibe dazwischen ist ?

Michael Schaefer

Michael Schaefer

Hi, dasist sehr interressant auch für Drehachsen, wo man kabellos Energie übertagen kann. Wieviel mA kann der Lader maximal?

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