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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) 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. 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. 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 ### 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. 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 ### Schematic