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Doc: Added some remarks regarding the CMT2300A module

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Thomas Basler 2023-04-11 23:12:20 +02:00
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README.md
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@ -118,7 +118,7 @@ Sample Picture:
Also supported: Board with Ethernet-Connector and Power-over-Ethernet [Olimex ESP32-POE](https://www.olimex.com/Products/IoT/ESP32/ESP32-POE/open-source-hardware)
### NRF24L01+ radio board
### NRF24L01+ radio board (See inverter table above for supported inverters)
The PLUS sign is IMPORTANT! There are different variants available, with antenna on the printed circuit board or external antenna.
@ -137,11 +137,19 @@ A heavily incomplete list of trusted hardware shops in germany is:
This list is for your convenience only, the project is not related to any of these shops.
### CMT2300A radio board (See inverter table above for supported inverters)
It is important to get a module which supports SPI communicatiton. The following modules are currently supported:
* EBYTE E49-900M20S
The CMT2300A uses 3-Wire half duplex SPI communication. Due to this fact it currently requires a separate SPI bus. If you want to run the CMT2300A module on the same ESP32 as a NRF24L01+ module or a PCD8544 display make sure you get a ESP which supports 2 SPI busses.
### Power supply
Use a power suppy with 5 V and 1 A. The USB cable connected to your PC/Notebook may be powerful enough or may be not.
## Wiring up
## Wiring up the NRF24L01+ module
### Schematic