VERSION 2.0 UPDATED WITH NEW FEATURES

The Coolboxx II is the first network enabled fan controller for GPU mining or AI server rigs. It comes packed with features that allow large server cluster to be managed from a single location.

The Coolboxx II is a powerful ESP32 based board for temperature monitoring and controlling high current PWM fans in Crypto Rigs and other applications that require high airflow. The ESP32 based board features the ESP-WROOM-32E module, with integrated WiFi and Bluetooth functionality (BR/EDR/BLE). The proven ESP32-D0WD-V3 chip is designed with TSMC ultra-low power management technology.

The Coolboxx II's plug-n-play software implements communications via the USB-C port to a Crypto Rig's motherboard running mining operating systems such as HiveOS, RaveOS, MMPOS and others (please verify with us if yours is supported). It allows the OS to manually control fan speeds or set the CoolBoxx II in Automatic Mode to allow the Coolboxx II to automatically control the fans with a rig optimized algorithm that maintains desired target temperatures based on GPU temperatures or the temperature of the case using the onboard AHT20 or attached DS18B20 sensors. It also has an over-temperature alarm function and monitoring actual fan speed and determines the "health" of your fans.

The Coolboxx II also performs a "watchdog" function based on a programmed timeout to reset the rig in the event of a crash or other event.

The Coolboxx II operates with or without being attached to a Wifi network over the USB port to your rig. By simply adding your WiFi credentials via the board's access point it attaches to your WiFi network. You can then use WiFi to access the board's Web Server interface or to monitor and control the Coolboxx II via MQTT, or a RESTFUL API, and sports a Home Assistant integration. The Coolboxx II can also operate without the USB communication in a standalone configuration supporting monitoring and control via the Web Server or the other above-mentioned interfaces.

ESP32andmore.com's staff is available 24/7 for support of the Coolboxx II board and integration assistance into any environment small or large.

The Coolboxx II's USB-C interface is also used for download of firmware. The board is flashed with an ESPHome image to allow immediate inclusion into your Crypto Rig, is WiFi enabled and supports OTA programming. It also has headers that allow the use with conventional D1 Mini style daughter boards and is therefore pin compatible with most accessories. The board has a JST SH connector with I2C or PDM interface and selectable (3.3/5V) power and ground compatible with Adafruit's STEMMA QT/ Sparkfun Qwiic sensors. With an optional JST SH to JST PH cable, it also supports STEMMA and Grove interfaces. On board is a AHT20 temperature and humidity sensor. It also has a 2-pin header for connecting the motherboard's reset pins implementing a watchdog function. It also has two, 3-pin screw connector for one-wire devices, each with 3.3v power and ground.

The Coolboxx II's has four Molex KK (PC fan style) that has one 5v driven output, one 5v tolerant input, in addition to fan (typ. 12v) power and ground **for 4+ amps per connector and up to 16 amps for all four connectors. It makes it the perfect board for controlling four or more high air flow fans such as the Wathai 12038 (230 CFM) or the Delta QFR1212GHE (250 CFM) to mention a few.

Specifications:

• Size: 84mm x 44mm with 2mm mounting holes
• Processor: ESP32 on ESP32-WROOM-E module with WiFi and BT V4.2
• Power Input: 12v @ 16 amps max via a 6-pin PCI-e connector or 5v via USB-C connector.
• 16amp input power max.
• On Board Regulation: 5v @ 2 amps switching regulator, 3.3v @ 1.0 amp.
• Onboard AHT20 Temperature and Humidity Sensor.
• Input/Output: One 5v tolerant input (1k pullup) and one 5v driven output, with 12V power (4+ amps per conn.) and ground on four, four-pin Molex KK series connectors. Compatible with most PWM PC style fans with speed return.
• I/O: Two screw down three position headers with common one-wire interface as well as 3.3v power and ground.
• I/O: USB 2.0 via USB-C connector using the CP2102N.
• I/O: Standard WEMOS daughter interface on two 1x8 pin headers.
• I/O: JST SH conn w/ I2C/PDM interface 3.3v/5.0v selectable power (compatible with Adafruit's STEMMA QT/ Sparkfun Qwiic sensors).
• I/O: Two-pin 2.54mm header for watchdog function.

Board ships with factory flashed firmware HA API enabled. If you would like your board(s) shipped with MQTT enabled, please email us (esp32andmore@gmail.com) with request at time of order.

Please note that some fans especially older ones do not conform with the "Intel 4-Wire PWM Controller Fans" specification. These fans do not stop spinning with a PWM duty cycle of 0% but spin at their minimum RPM. Below is a list of some of these fans currently known to us:

• Corsair 31-002319.
• Delta QFR1212GHE (and very possibly other Delta fans).
• upHere 12BK4-3 (https://a.co/d/7IRi3T8).

A 3D printed enclosure is also available: