Symptom: Module resets randomly or never initializes.
Fix: Pull RESET to VCC with a 10k resistor (do not short directly to VCC unless your MCU GPIO can drive it low reliably).
Let’s walk through a complete wiring example using an ESP32 (widely used for IoT). This setup allows you to use popular libraries like SmartRF or Ebyte’s e07-m1101d Arduino library.
Connections:
| e07-m1101d | ESP32 GPIO | Function | |------------|------------|-------------------| | VCC | 3.3V | Power | | GND (pin1) | GND | Ground | | SI (pin3) | GPIO23 | SPI MOSI | | SCK (pin4) | GPIO18 | SPI SCK | | SO (pin5) | GPIO19 | SPI MISO | | CSn (pin6) | GPIO5 | SPI SS | | GDO2 (pin7)| GPIO4 | Interrupt / status| | GDO0 (pin8)| GPIO2 | Optional | | RESET (pin9)| 3.3V via 10k| Pull-up | | GND (pin10)| GND | Extra ground |
Arduino code snippet for initialization: e07-m1101d pinout
#include <ELECHOUSE_CC1101.h>
void setup() Serial.begin(115200); ELECHOUSE_cc1101.setSpiPin(5, 18, 23, 19); // SS, SCK, MOSI, MISO ELECHOUSE_cc1101.Init(); ELECHOUSE_cc1101.setCC1101(433.0); // Set frequency Serial.println("e07-m1101d ready");
| Pin Number | Pin Name | I/O | Description | Notes | | :--- | :--- | :--- | :--- | :--- | | 1 | VCC | Power | Power Supply Input | Connect to 3.3V. Do not exceed 3.6V. | | 2 | GND | Power | Ground | Connect to system ground. | | 3 | ANT | I/O | Antenna Interface | Connect to a 50Ω antenna. Do not leave floating. | | 4 | GND | Power | Ground | Connect to system ground. | | 5 | TXD | Output | UART Transmit | Connect to MCU RXD. | | 6 | RXD | Input | UART Receive | Connect to MCU TXD. |
(Note: On some versions of EBYTE modules, Pins 5 and 6 might be labeled as DATA/CLK or DI/DO if they operate in SPI mode. However, the "D" in M1101D usually signifies a built-in MCU for UART serial transmission, making TXD/RXD the correct interface for standard usage.) Symptom : Module resets randomly or never initializes
E07-M1101D -> Arduino (3.3V version, e.g., Pro Mini 3.3V)
VCC (Pin 2) -> 3.3V GND (Pin 1) -> GND RXD (Pin 3) -> TX (Pin 2 on SoftwareSerial, or D1 on Uno) TXD (Pin 4) -> RX (Pin 3 on SoftwareSerial, or D0 on Uno) AUX (Pin 5) -> Digital Pin 4 (optional) M0 (Pin 6) -> Digital Pin 5 (or GND for default) M1 (Pin 7) -> Digital Pin 6 (or GND) RST (Pin 8) -> Digital Pin 7 (or 3.3V via 10kΩ)