Questions tagged [debounce]

When a mechanical switch closes it's contacts typically do not close "cleanly" and tend to bounce or chatter. This rapidly switching signal could be misread in certain situations so it is usual to attempt to reduce this bouncing to ensure a clean switch detection. the danger is that if the switch is not de-bounced you can detect multiple events from one opening or closing. Can be accomplished using analog circuits or digital circuits.

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232 views

Induced power supply noise on switch contact

I have a circuit that has a 24V section and a 5V section, separated by opto-isolators and an isolated DCDC converter. Both sides of the DC-DC have decoupling caps, and the MCU has one per Vcc pin. ...
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1answer
188 views

Switch bounce vs LC Spike Voltage

For my EE lab, our professor wants us to show switch bounce, and then eliminate it using hardware, and software debouncing. However, I seem to be stuck on finding the switch bounce in the first ...
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1answer
72 views

Mitigate voltage drops when using a relay

Hi and thank you for reading my question. I have a small experimental solar panel setup which charges a deep-cycle battery using an MPPT converter. I would like to power some garage and garden lights ...
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4answers
241 views

How do you pick component values for a debouncing filter?

I bought an incremental/quadrature rotary encoder for a project I'm working on. The specs: https://www.bourns.com/docs/Product-Datasheets/PEC12R.pdf They provide a diagram of a suggested filter ...
1
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1answer
127 views

Preventing long-press button function on DFPlayer board

I'm using DFPlayer in stand-alone mode (no Arduino) for a music project. The buttons all have short-press and long-press commands. I want to trigger a short-press command by releasing a depressed ...
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0answers
284 views

Debouncing circuit to count the pulses of a water meter with pulse emitter

I want to design a debouncing circuit to count the pulses of a water meter with pulse emitter (it behaves like a push-button). The microcontroller is the msp430g2553. I want to eliminate the rebounds ...
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0answers
439 views

555 to debounce comparator output for PIR circuit

I'm trying to create a circuit that takes an input from a PIR and outputs a high signal when movement is detected. My circuit currently looks like the schematic below (VCC is 5V). The circuit works ...
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0answers
52 views

I couldnt' prevent button arc

Guys i have a circiut in below. There is a problem: i couldn't fix how to prevent this arc on my button. At 2. & 4. pins of button have 100nF and a resistor 1M to series these 2. and 4. pins. When ...
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3answers
81 views

How to debounce a low pulse switch for automotive lighting

Hoping you guys can give me a hand with some wiring that I can't quite figure out! Background: I'm trying to rewire a set of automotive lights - these are normally controlled by a computer but I'm ...
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0answers
51 views

Driving transistors without using MCUs

I'm trying to drive transistors with just a push of a button without using a MCU. The circuit I drawn drives different transistor on every button push and resets back. First part is a debounce circuit ...
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0answers
39 views

Simplest schmitt trigger with fewest part count for microcontroller

I own several AT89C4051 microcontrollers and I'm currently trying to read signature bytes of the micros that I probably broke (by applying 7.2V to the VCC pin before noticing the 5V regulator became a ...
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0answers
84 views

Powering off a switching regulator causes MOSFET to briefly blip on. Arduino

I have stumbled upon a weird issue in my circuit below, that only happens when the DPDT slide switch, S1, goes from an upwards position(On) to the downwards ...
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0answers
534 views

Debouncing and hysteresis questions about a Schmitt trigger circuit

Above is a switching sensor which outputs ON OFF pulses by the 33k pull-down resistor. V2 and R_SW models the switching. The sensor output is needed to be measured between 1Hz upto 150Hz. I'm planning ...
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1answer
183 views

How to calculate the state debounce time for an analog voltage input pin?

An analog voltage input pin (AVP) of an ECU has an input voltage range of 0 to 10V and a Filter Frequency Limit of 330Hz. The input signal voltage (ISV) coming from a sensor to the AVP has a range ...