Find yourself constantly replacing microcontrollers with 555 timers? Look no further, as we've designed the fully-assembled Adafruit 555 PWM Output STEMMA - a timer board with adjustable PWM output for all your wiring needs. No more hassle with multiple components, just a precise, buffered output at your fingertips.
The initial concept for this product was sparked by a request for a 'PC Fan Dummy' board that would produce a 100Hz signal to mimic a PC fan's tachometer signal for a motherboard. However, upon further consideration, we realized that there are other potential uses such as generating a square wave for piezo driving, audio input, or IR signal modulation. As a result, we expanded the design to be more versatile and applicable in various scenarios.
Choose between two 'ranges': 1.4K~25 KHz or 1.4~250 Hz. Use the onboard trimmer pot to adjust the output within these values. For more precise measurements, you can utilize a logic analyzer, oscilloscope, multimeter with frequency-counting, or audio input jack on a computer. The output is a DC square wave, generated by a 74HC1G04 buffer capable of sinking/source up to 12.5mA.
You can power the board from 3V to 12VDC, an onboard regulator will pin the input to the 555 and buffer to 5V max. That means that between 3V and 5V power, the signal peak will be at the same logic level as the power. Above 5V, the output will be pegged to 5V.
Each STEMMA board is a fully assembled and tested PCB but no cable. No soldering is required to use it, but you will need to pick up a 2mm pitch, 3-pin STEMMA JST PH cable. Alternatively, if you do want to solder, there's a 0.1" spaced header for power/ground/signal.
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