jackandjohn Posted February 10, 2018 Share Posted February 10, 2018 I've gotten the board up and running and on Wifi, but this is supposed to be a dim wifi 'lamp'. Just to start out: how do I connect the +- to the board How do I tell the board to power on the leds And for more advanced: Is it possibly to do voltage-limiting dimming as opposed to PWM If no: what's the best way to do PWM? (I'm perfectly fine with creating a c program that simply turns it on and off at a specified hz, but there may be a more elegant tool I'm not aware of) Thanks Link to comment Share on other sites More sharing options...
pzw Posted February 11, 2018 Share Posted February 11, 2018 Since LEDs are current devices, they cannot be easily controlled in the voltage domain. So if you do not want to do pwm control, then you need to do current control. PWM control is a lot easier! You need to use a driver circuit to control your LEDs. That can be as simple as a uln2803 chip, or a complicated current limiting discrete circuit. First figure out what the voltage is you need to control, and the total amount of current. Then we might be able to help. 2 Link to comment Share on other sites More sharing options...
pzw Posted February 11, 2018 Share Posted February 11, 2018 Forgot to mention; easy way to generate pwm is to use a pca9685 chip connected to i2c. Adafruit sells a board with it, and it even has the right resistors installed so you can hook up a led directly... Link to comment Share on other sites More sharing options...
pzw Posted February 19, 2018 Share Posted February 19, 2018 Very disappointing that the topic starter hasn't followed up... Link to comment Share on other sites More sharing options...
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