- Working with LED’s – And Wiring 4 pin RGB led to Raspberry PI | Einhugur Tech Blog
- Powering a series circuit:
- Working with LED’s – And Wiring 4 pin RGB led to Raspberry PI
- Connect the LEDs to an on/off switch
You can then use our current limiting resistor calculator to calculate the correct resistor based on your power supply voltage. Another essential part of proper led wiring, is first of all to verify the actual voltage output and current capability of your power source.
Using your inexpensive meter, set the meter to read VOLTS DC, and put the red positive lead on the positive of your power source, and the black negative lead on the negative of your power source, and the measure the voltage of your power source. Once you know your power supply voltage, you then make your calculations based on the led information supplied by the manufacturer voltage drop and maximum current.
Working with LED’s – And Wiring 4 pin RGB led to Raspberry PI | Einhugur Tech Blog
After wiring your leds with the proper current limiting resistor s in place, then using the same simple, inexpensive meter, you measure the current, buy put the meter to the MILLIAMPS or AMPS setting, and placing the meter in line in series with the led s measure the current flow to make sure it is within the maximum operating current of the leds. If the reading is too high or too low, you can either adjust your power supply voltage, or adjust the resistance value of your current limiting resistor s until you reach your desired reading.
Leds can be Wired In Series: In series wiring the forward voltage drops are additive, but the current requirement stays the same If you had 6 red leds in series, then 12 volts at 20 milliamps is required.
In parallel wiring, the current requirements are additive, but the voltage drop remains the same; for example, if each red led has a 2 volt forward voltage drop and a maximum 20 milliamps, and you put 2 in parallel, then you will need 2 volts at 40 milliamps to drive the leds to maximum brightness If you had 6 red leds in parallel, then 2 volts at milliamps is required. The object is to find which method or combination of methods gets your power requirements in your led wiring scheme, to closly match the power source.
Powering a series circuit:
Having voltage much higher than needed results in the need for very large, expensive, hard to find, and inefficient current limiting resistors that waste energy by getting real hot. By using a power supply that is just slightly higher voltage than needed,or by putting leds in series will result in a more efficient design, and the current limiting resistors needed will be much smaller and very inexpensive and easy to find.
If you need to hook up many leds The correct way is to place several leds in series, and then several series strings in parallel with each other, thereby needing neither the high voltage needed with series wiring, or the high current needed with all parallel wiring. Automotive voltages fluctuate from under 12volts dc to as high as We suggest using current limiting resistors based on your highest battery reading with alternator running full blast.
Working with LED’s – And Wiring 4 pin RGB led to Raspberry PI
To complicate it a bit then I have seen RGB led where the anode was shared and there were three cathodes. I thought the spec of the led that I used was around 2 Vf for Red with max 50mA current.
The connection was done as shown in the drawing above, connecting to one resistor at a time to check their current draw. Note that the 3,3 V output has maximum draw of 50 mA so you cannot do tests like this on just anything. If only having calculating values then its not bad idea to go with a little higher value resistors than you calculated to protect the pins just in case. Thats it for now. You must be logged in to post a comment. Pieces we use are: Some resistors types depend on spec of your RGB led We are going to be using digital multi-meter to verify the spec of the LED and to verify our calculations.
But if you know the specs of your LED for sure then you will not be needing this.
Connect the LEDs to an on/off switch
Digital multimeter is really one of the first things you should have if you are going to be playing around with electronics. Then we can apply the Ohms law: We are in this example going to aim for 5 mA. Wiring of the RGB 4 pin led: To complicate it a bit then I have seen RGB led where the anode was shared and there were three cathodes I thought the spec of the led that I used was around 2 Vf for Red with max 50mA current.
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I had the LED on mini bread board because of this middle step it was easier to deal with it.