user26203: I have a remote controller for a portable heater, and working on a small project to be able to control the fan on/off from an arduino with Bluetooh HM-10 module. I thought a solenoid might work by mounting on top of the remote but it doesnt have enough force, I want to remove/desolder the mechanical button and figure out a way to control it without the switch but kind dont really know what circuit 
I should use, kind of just learning how to use arduino. 
Images of remote and button traces below. 
Any idea how I could wire this up to arduino via some switch/relay circuit? Any circuit design / schematic would be helpful



user53320: I would unsolder the switch then solder in a FET in the configuration shown below. The FET will act as a switch and may be controlled with any digital output from your Arduino board. When selecting a FET makes sure you find something that will fit the foot print you have to work with on your board, and the gate-source threshold voltage is rated to handled 5V.


26203: <p>I have a remote controller for a portable heater, and working on a small project to be able to control the fan on/off from an arduino with Bluetooh HM-10 module. I thought a solenoid might work by mounting on top of the remote but it doesnt have enough force, I want to remove/desolder the mechanical button and figure out a way to control it without the switch but kind dont really know what circuit 
I should use, kind of just learning how to use arduino. </p>

<p>Images of remote and button traces below. </p>

<p>Any idea how I could wire this up to arduino via some switch/relay circuit? Any circuit design / schematic would be helpful</p>

<p><a href="https://i.stack.imgur.com/mwuYO.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mwuYO.jpg" alt="enter image description here"></a></p>

<p><a href="https://i.stack.imgur.com/FbZBe.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FbZBe.jpg" alt="enter image description here"></a></p>
 53320: <p>I would unsolder the switch then solder in a FET in the configuration shown below. The FET will act as a switch and may be controlled with any digital output from your Arduino board. When selecting a FET makes sure you find something that will fit the foot print you have to work with on your board, and the gate-source threshold voltage is rated to handled 5V.</p>

<p><a href="https://i.stack.imgur.com/KBe0K.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KBe0K.png" alt="circuit"></a></p>
