Hi all,
I could really use some help. I am using a Wemos D1 Mini (ESP8266) to power a 3-5V 125mA DC motor. Ultimately it will run on a 3.7V 18650 battery.
I use D2 on the ESP to switch the IRFZ44 MOSFET and use a 1N4001 rectifier diode in the circuit as attached.
When I use the 3.3v from the ESP to power the motor directly, it runs perfectly. However, when I use the IRFZ44 as relay, the maximum voltage the motor gets is 1.85V from the 3.3V total supplied. If I run the system on the 3.7V battery (delivering 4V actually on load) the motor gets 2.5V. In both situations it looks like I lose 1.5V in the MOSFET that I shouldn't.
I am totally lost here. Any1 got a suggestion?