There is a large list of radiator fan mounting models
But there are no open PCBs to control the fans, read out temperatures and to monitor/control it over wifi. Instead of implementing everything from scratch, the ESP8266 based Wemos Lolin D1 mini v4.0 can be used. Only a simple IO board + enclosure had to be designed. It is responsible for:
There are two versions available. One with only through-hole components and one with mostly SMD components. The former is easier to assemble but the SMD version is also not too difficult. The PCB itself can be produced using the attached gerber files by JLCPCB, Aisler, PCBWay, OSH Park, ...
Please check the ibom.html inside the gerber zip files to get the list of components which need to be ordered for the PCB.
The Wemos Lolin D1 mini v4.0 should be installed (while not being mounted to the PCB) using the Tasmota Web Installer. After the installation finished, it has to be mounted on the PCB and configured via the devices' web interfaces (under Configuration):
# Control with Dimmer/Color commandsSetOption15 1# Single Channel PWMSetOption68 0# Set PWM frequency (25000 would be correct but Tasmota only has PWM_MAX set to 4kHz)PwmFrequency 4000# Ensure PWM range is 0..1023PWmRange 1023The rules are helpful to configure when the fans should be started. They need to be configured in the console:
# rule1 is used to control the fan based on the temperaturerule1 on DS18B20#Temperature<34.5 do power1 off endon on DS18B20#Temperature>=35.0 do power1 on endon on DS18B20#Temperature>=45.0 do channel2 100 on break on DS18B20#Temperature>=40.0 do channel2 98 on break on DS18B20#Temperature>=35.0 do channel2 93 on endon# activate the rule1rule1 on# rule2 disables/enables the first rule at specific times# the odd timers are used to enable rule1# the eventtimers are used to disable rule1 + stop fansrule2 on Clock#Timer=1 do Rule1 1 endon on Clock#Timer=2 do Rule1 0 endon on Clock#Timer=2 do power1 off endon on Clock#Timer=3 do Rule1 1 endon on Clock#Timer=4 do Rule1 0 endon on Clock#Timer=4 do power1 off endon on Clock#Timer=5 do Rule1 1 endon on Clock#Timer=6 do Rule1 0 endon on Clock#Timer=6 do power1 off endon on Clock#Timer=7 do Rule1 1 endon on Clock#Timer=8 do Rule1 0 endon on Clock#Timer=8 do power1 off endon on Clock#Timer=9 do Rule1 1 endon on Clock#Timer=10 do Rule1 0 endon on Clock#Timer=10 do power1 off endon on Clock#Timer=11 do Rule1 1 endon on Clock#Timer=12 do Rule1 0 endon on Clock#Timer=12 do power1 off endon on Clock#Timer=13 do Rule1 1 endon on Clock#Timer=14 do Rule1 0 endon on Clock#Timer=14 do power1 off endonrule2 onFor the enclosure, a couple of extra parts need to be purchased:
| bottom.stl | 1.2MB | |
| gerber_ibom_smd.zip | 290.7KB | |
| gerber_ibom_throughhole.zip | 294.5KB | |
| housing.FCStd | 5.0MB | |
| kicad_src_smd.tar.xz | 423.8KB | |
| kicad_src_tht.tar.xz | 422.7KB | |
| top_70mm.stl | 703.2KB | |
| top_80mm.stl | 702.8KB |
