Use reliable power supply
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Always check power supply polarity when making all the connections. The module will be permanently damaged after such situation. Damage caused by connecting M-On to the cross-poled PSU will not be covered by the warranty!
Power supply unit
Use good, stabilized PSU only. Please make sure that it's Amperage rate covers all consumers such as relays. Also PSU must be able to filter most surges, for example when you are controlling inductive loads.
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Connect to the negative output of your PSU.
1-wire (3w mode) bus for DS18b20.
16 bit PWM
two PWM channels, 1 logic level is 3.3V. Maximum output current is 20mА.
Maximum current is 20mА, logic 1 is 3.3V.
'Vin', 'GND' and 6 IO ports (same with usual ports). Used for such situations where you need to use 2.54 pitch connector or make all commutation in the front of the module.
10 bit ADC
Analog input. Measures 0-3.3Vdc
Popular and widely available humidity sensor can be used with "humiditystat" feature.
Connect to the positive output of your PSU. Only DC current of 5-26V
with ULN2003 on-board. Used for driving "heavy" (up to 500mA) and unductive loads, such as relays, solenoids etc. Sold separately!
Short those before powering module to make the reset. More information is in User's manual.
"HIGH level trigger" relays can be connected directly.
For "LOW level trigger" it's recommended to use DRCA. Make sure that the coil Voltage is equal to PSU's one.
Any relay with coil of up to 500mA can be connected with DRCA or with additional transistor.
With DRCA you can emulate power and reset buttons function to power-on and reset PCs, servers, mining rigs etc.
Temperature sensor's bus, recommended wire is twisted pair of 30-40m overall length. All sensors are in parallel, mixed topology is possible.
Such PWM fans can be controlled without any additional hardware. Make sure that the ground of M-On and FAN is common.
You can connect up to 2 servos to the module. Make sure that your PSU is strong enough to drive servos without voltage surges.
Point to colored circles to read more info.
User's manual: Mini-On_-_Users_manual_en.pdf