Temperature Display Setup Guide

General
1

I recently set up an ESP32 with a MAX6675 sensor and a TM1637 display to show temperature readings. Here’s how I did it, and some tips to avoid common pitfalls:

Step 1: Understanding the Components

  • ESP32: The microcontroller that handles everything.
  • MAX6675: A sensor that reads temperature from a thermocouple.
  • TM1637: A 4-digit LED display module.

Step 2: Correct Configuration

Here’s the corrected configuration that avoids the reference issue:

yaml
esphome:
name: termometro_caldaia
friendly_name: Termometro caldaia
esp32:
board: esp32-s3-devkitc-1
framework:
type: esp-idf
logger:
api:
encryption:
key: “cancelled”
ota:
- platform: esphome
password: “cancelled”
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
ap:
ssid: “cancelled”
password: “cancelled”
captive_portal: true
spi:
miso_pin: GPIO13
clk_pin: GPIO12
sensor:
- platform: max6675
name: “Temperature”
id: temperature_sensor
cs_pin: GPIO45
update_interval: 10s
display:
- platform: tm1637
id: tm1637_display
clk_pin: GPIO4
dio_pin: GPIO5
inverted: true
intensity: 3
update_interval: 10s
lambda: |
it.print(0, id(temperature_sensor).state);

Key Fixes:

  1. Lambda Function: Instead of referencing a Home Assistant entity, we directly use the sensor’s ID (temperature_sensor).
  2. Sensor Naming: Simplified the sensor name for clarity.
  3. ESPHome Integration: Ensures everything is handled within ESPHome without external entity references.

Step 3: Testing

After uploading the configuration:

  1. Check the ESPHome dashboard to ensure the sensor is reading correctly.
  2. Verify the display shows the temperature in real-time.

Troubleshooting Tips:

  • Check Connections: Ensure all wires are correctly connected, especially the SPI pins.
  • Power Supply: Make sure the display has a stable power supply; TM1637 can be sensitive.
  • Sensor Placement: Ensure the thermocouple is properly connected and placed in the environment you’re measuring.

Final Thoughts

This setup is a great way to monitor temperatures in real-time without needing external servers or complex integrations. It’s also a good learning project for understanding how sensors and displays work together in ESPHome!

If you have any questions or run into issues, feel free to ask!