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I need the SPI pins of U1 to connect U2 to it
vasyl

vasyl

@copilot I need the SPI pins of U1 to connect U2 to it
2y

copilot

Sure, here are the specific pins on both U1 and U2 that you need to connect to facilitate SPI communication:
On U1 (Adafruit's 3857):
  • MISO (Master In Slave Out) is Pin 13, labeled as "MI".
  • MOSI (Master Out Slave In) is Pin 12, labeled as "M0".
  • SCK (Serial Clock) is Pin 11, labeled as "SCK".
  • SS (Slave Select) can be any GPIO pin you select, but it is often done with D10 (Pin 23), labeled as "D10".
On U2 (RFM95W)
  • MISO corresponds to Pin 2, labeled as "MISO".
  • MOSI corresponds to Pin 3, labeled as "MOSI".
  • SCK corresponds with Pin 4, labeled as "SCK".
  • NSS (which stands for "Negative Slave Select" and essentially fulfills the same role as SS) corresponds to Pin 5, labeled as "NSS".
Therefore, the connections on your Flux project should be:
  • U1-MI (Pin 13) to U2-MISO (Pin 2).
  • U1-MO (Pin 12) to U2-MOSI (Pin 3).
  • U1-SCK (Pin 11) to U2-SCK (Pin 4).
  • And you will assign a digital pin for U1's Slave Select (like D10 on U1) and connect it to U2-NSS (Pin 5).
Remember, you might need to reconfigure these connections in your microcontroller's software, especially the Slave Select pin.
Also, keep in mind the voltage level compatibility between the modules. Both Adafruit's 3857 and the RFM95W run on 3.3V, so you shouldn't encounter any issues on that front.
2y
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Adafruit Feather M4 Express LoRa HAT(915MHz)

Adafruit Feather M4 Express LoRa HAT(915MHz) thumbnail
This project is a communication device designed with Adafruit's 3857 Microcontroller (U1) and Hoperf's RFM95W-915S2 RF module (U2). The microcontroller interfaces with the RF module via SPI protocol for wireless data transmission. The project also includes a capacitor (C1) and an SMA connector (J1). #LoRa #IoT #project #M4 #Adafruit

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