0
\$\begingroup\$

I read with interest here this post: How can I use an Arduino to simulate button presses on this PCB

I am a beginner in this and I am trying to learn how to do this based on a small remote control I would like to simulate a fake press using an arduino.

I am also not sure if I need to use a MOSFET as it is a very small device requiring little amperage so I think a small transistor will do ?

Basically, I would like Arduino to send a signal to the 2 red points here that will simulate a fake button press.

enter image description here

Hope I am making sense here. I appreciate any guidance or pointers on what I need to make this happen. Thanks !

More details to share: With COM on Battery-Negative and the other lead:

  • on the right side of the button = 12V. When button is pressed = 12V

  • on the left side of the button = 0V. When the button is pressed = 12V.

I will just focus on one button. Disregard the other button.

@Dave Tweed https://electronics.stackexchange.com/users/11683/dave-tweed If you are listening, I would really appreciate if you can share some advice.

Thanks all

\$\endgroup\$
3
  • 1
    \$\begingroup\$ Does this answer your question? How can I use an Arduino to simulate button presses on this PCB \$\endgroup\$
    – Huisman
    Dec 31, 2019 at 8:39
  • \$\begingroup\$ Welcome to SE.EE! Please don't post duplicates. Regarding your question: a small mosfet will work as good as a small BJT. \$\endgroup\$
    – Huisman
    Dec 31, 2019 at 8:41
  • \$\begingroup\$ Thanks. That referenced article provided a rough guidance but I am looking for how-tos - ie. - What to buy - How to wire up to an arduino ? - How to connect to those 2 points - etc Sorry, I am really new to this so a prescriptive guidance and how-to documentation will really help me. Thanks ! \$\endgroup\$ Dec 31, 2019 at 8:56

2 Answers 2

1
\$\begingroup\$

This is just the first step towards your goal. You need to figure out whether the buttons, when pressed, connect the chip input to battery negative (pulling the input low) or battery positive (pulling the input high).

schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. Low-side switching and high-side switching.

  • Switch your multimeter to DC volts and connect the COM lead to battery negative.
  • Connect the V lead to one side of SW1 and note whether you get a low (0 V) or high (+12 V).
  • Now press SW1 and see if the voltage changes. If not then move to the other side of the switch and repeat.
  • Repeat the test on the other switch.

If you have the arrangement of Figure 1a the solution may be fairly easy.

\$\endgroup\$
12
  • \$\begingroup\$ Thanks for your help and reply. Here are the results I got from what you asked me to do: With COM on Battery-Negative and the other lead: - on the right side of the button = 12V. When button is pressed = 12V - on the left side of the button = 0V. When the button is pressed = 12V. I will just focus on one button. Disregard the other button. What is next ? \$\endgroup\$ Dec 31, 2019 at 14:02
  • \$\begingroup\$ I may not be able to help you complete this project but did you figure out whether you've got a Figure 1a or 1b circuit? \$\endgroup\$
    – Transistor
    Dec 31, 2019 at 14:19
  • \$\begingroup\$ Sorry, I dont :( I am new to this. \$\endgroup\$ Dec 31, 2019 at 14:25
  • \$\begingroup\$ I've added voltmeters to the schematic. Can you see it now? \$\endgroup\$
    – Transistor
    Dec 31, 2019 at 14:34
  • \$\begingroup\$ Thanks. I am not sure I follow. I followed your instructions and gathered the results. See my main post for more details of the results. I had the COM to the Battery Negative and the other lead of both sides of the button. The right side reads 12V and the left reads 0. But when the button is pressed - both sides read 12V \$\endgroup\$ Dec 31, 2019 at 14:43
0
\$\begingroup\$

Ok. Solved.

5V relay 10A ? VCC to Input, GND to GND and + to 5V and the NO wires connected to the 2 outlined contacts of the RC button. Thanks to @Transistor for the guidance and help.

\$\endgroup\$
1
  • \$\begingroup\$ If the question is solved you should upvote and accept one or other answer. \$\endgroup\$
    – Transistor
    Feb 17, 2020 at 7:19

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.