Teensy 2.0 and Lora

G

Gilbert

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I'm working on a project which is using CYD (touchscreen with embedded ESP32) as user interface. Can't use that ESP32 to connect with a Lora module (RFM95W) because the touchscreen module doesn't expose the SPI pins. I don't want to hack the module because I'm concerned that messing with the SPI pins which are used to handle the touch screen and display might cause a lot of trouble. The solution I have in mind: I have an old Teensy 2.0 in my drawer. Hook it up with the ESP 32 using the UART and let the Teensy handle the Lora radio (and a bunch of relays and sensors). Can Teensy 2.0 handle an RFM95W or would that be too much?
PS: programming will be done using the Arduino IDE.
PPS: Google tells me that using Teensy 8-bit MCU for Lora is a bad idea because it lacks processing power ???
 
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I'm assuming that you suggest to use the ESP 32 to handle Lora? Doesn't solve my problem. I need a slave MCU (hence the Teensy) to handle relays and sensors as the CYD module is short of GPIOs. And that consumes the (only one availble) UART on the CYD module. Back to square one ;-(.
Moreover, I have two RFM95 modules catching dust on my desk.
 
Gilbert said:
I'm assuming that you suggest to use the ESP 32 to handle Lora? Doesn't solve my problem. I need a slave MCU (hence the Teensy) to handle relays and sensors as the CYD module is short of GPIOs. And that consumes the (only one availble) UART on the CYD module. Back to square one ;-(.
Moreover, I have two RFM95 modules catching dust on my desk.
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You could use Software Serial on the Teensy 2. It compiles ok for the T2. I don't have one to test, that will be down to you.
 
Thanks for trying to sell me on the EBYTE Lora module. Found the answer to my question: the Adafruit Feather module uses RFM95 with the same MCU (32U4) as Teensy 2.0. Shouldn't be a problem to get this to work.
 
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