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A 3-channel fully automated Dew Controller (DIY project) based on Arduino Nano for telescopes. For $48 or less.
(c) Copyright Robert Brown 2014-2025. All Rights Reserved.
Permission is granted for personal and Academic use only. Code or portions of code may not be copied or used without appropriate credit given to author.
A very popular project with over 48,000 downloads.
There is a new ESP32 WiFi version at https://sourceforge.net/projects/esp32-dew-controller/
The older myDCP2 (two-channel dew controller) is found here https://sourceforge.net/projects/arduinonanodewcontrollerpro/files/myDewController%20v200%202channel/
Features
- FULLY AUTOMATIC OPERATION - NO USER INTERVENTION REQUIRED
- Windows, Linux, INDI, Bluetooth, Android support for remote control/logging/monitoring
- Utilize standard dew straps such as DEW NOT via PWM output, 12VDC
- Three tracking algorithms, DewPoint, Ambient and MidPoint with adjustable band offsets
- 3 independent controlled dew channels
- Each dew channel powered by high efficiency MOSFET
- 3 independent temperature probes DS18B20
- Calibration setting for each temperature probe
- Controller automatically adjusts power to dew straps (0, 10%, 20%, 50%, 75%, 100%) as required
- Supports manual override switches to boost PWM power to 100% for each dew channel
- DHT11/21/22 or HTU21D I2C Temp/Humidity sensor support
- LCD1602 (or LCD2004) display all settings
- Reverse voltage protection on 12VDC input
- Key session state values saved in EEPROM for later retrieval
- 12VDC cooling fan support, speed PWM controlled with RGB LED indicator
- LEDS indicate if PWR is on to dew channels (brightness indicates % pwr applied)
- Low cost
- Data logging of parameters to CSV file
- Can be controlled or monitored remotely via USB connection or Bluetooth
- Bluetooth wireless support
- MOSFET Design for good performance
- DO NOT DOWNLOAD SOFTWARE FROM OTHER SITES AS AN EXE/ISO/ZIP FILE - THESE FILES ARE NOT SUPPORTED AND MAY CONTAIN MALWARE
Project Samples
License
Creative Commons Attribution Non-Commercial License V2.0Follow Arduino Nano Dew Controller Pro (DIY)
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