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  1. Stoneww

    Need help with a multiplexer

    Hey, I have a project and I want to use a multiplexer to periodically switch between 5 different inputs (analog) to be output one by one, the output will be fed to a microcontroller. The same microcontroller is used to signal which input should be output. NOTE: the voltages read by the mux will...
  2. Stoneww

    Measuring Current via voltage measurement

    Hey I am doing a project using the TCRT5000 which is a phototranistor with an IR LED. I need to measure the current through the transistor. We get told to add a resistor and measure the voltage accross it using a voltmeter (and then I= V/R) instead of measuring current directly using a ammeter...
  3. Stoneww

    Making a FM transmitter

    Hey, I've been trying to make a transmitter but I've been struggling to read circuits. So could someone please explain this circuit to me and then maybe tell me how they go about reading circuits. Thank you I know little parts of it but others I have no clue why components are there or what...
  4. Stoneww

    Bi-directional Motor with speed control circuit

    Hello I'm trying to make a circuit to make a motor spin in both directions and so that I can alter its speed. >The blue rectangle is the part of the circuit for the bi-directional control. The blue rectangle circuit works prefect on its own >The green rectangle circuit is used to alter the...
  5. Stoneww

    Determining LED values

    I'm just curious if there is a way to get the LED threshold voltage, or the current rating from any other way than checking the manufacture's datasheet.
  6. Stoneww

    RC Car

    If anyone has an idea of how I could make an Radio controlled car I'd really appreciate it. I can't find any good guides & I tried doing it myself coding it with arduino UNO but it didn't work as intended. So maybe: Block diagram Things I need General Idea of how the code will look. ( Mine...
  7. Stoneww

    Arduino motor controller ( To be)

    I've been trying to make a motor control circuit with PWM. The end goal is to have a working buggy. Now my problem lies within the fact that the frequency of these LEDs when they are powered is pretty low, I don't have a tool to measure it but I can see the LEDs clearly flashing. The...
  8. Stoneww

    Choosing a transistor

    I'm never sure which transistor to use. I cannot seem to make sense of the datasheets as they're too intimating. So could someone please inform me when to use which transistor or when it's better to use a MOSFET & for these examples: >3V LED >5V Motor I just need to know what is important in...
  9. Stoneww

    Basics of IF and Else statements (Arduino)

    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ void setup() { pinMode(10, OUTPUT); pinMode(2, OUTPUT); pinMode(12, INPUT); pinMode(A0, INPUT); } void loop() {...
  10. Stoneww

    How to get a certain duty time

    I've been trying to make a PWM circuit, i've made the astable circuit fine but im really struggling to get a certain duty time with the resistors. I want it to be variable but best values I can get is to change from 54% and 83% where as I want it to be adjustable between like 20% to 80%. I...
  11. Stoneww

    P=I*R

    Just a short question, wondering why people tend to use P=I^2*R instead of the standard P=IV
  12. Stoneww

    PWM circuit

    Wanted to make a pulse width modulation circuit for a motor. I managed to successfully make an astable with a potentiometer which allows me to change the duty time. I managed to get it to work with an LED with the use of a transistor but I cannot seem to get it working with a motor. Im assuming...
  13. Stoneww

    Relay

    Hey I've been trying my best to get this relay circuit working for about a week now, help would be very much appreciated :) I've managed to get the comparator working as well as the transistor. However the transistor wasn't enough to power a motor. I've tried the motor with a relay but even...
  14. Stoneww

    Variable Power Supply

    Hey I want to make a Variable Power supply but I'm not sure if it will work. My idea is to have a few batteries in series and then use a potential divider with a variable resistor to change the out put voltage. Can anyone tell me if this would work? Thanks I'm also thinking if I can...
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