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Posts Tagged ‘PWM’

4-20 mA current output for Arduino Uno

Tuesday, November 1st, 2016

Giovanni Carrera writes, "The purpose of this project is to provide a 4-20 mA output from a PWM signal generated by a microcontroller ATmega328 and numerous other chips, such as the PIC. One of the more interesting applications of this circuit would be to replace or to realize a smart...

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Fan controller project

Thursday, October 27th, 2016

Lucky Resistor has written up documentation on his fan controller project: The fan controller described on this project page, controls one or more PWM controlled 12V PC fans. It uses the input from two precise DHT22 based temperature sensors. The MCU is an Arduino Uno, which is powered using a...

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An isolated analog output for Arduino Uno

Friday, October 7th, 2016

Giovanni Carrera writes: This project completes the series of my articles about the Arduino analog I/O with the aim to use it as a controller of small automation systems. In control systems of the industrial plants it is always advisable to isolate both the inputs and the outputs coming from...

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Temperature controlled fan

Tuesday, April 12th, 2016

Lukas Fassler from Soldernerd has written up documentation on his DIY fan controller project: I’m currently mainly working on my new anemometer design but once in a while I get distracted. For example when my Keysight E3645A lab power supply was making so much noise that I could hardly concentrate. That’s when...

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PWM dimmer for RGB LED

Monday, March 7th, 2016

Lukas Fassler has designed and built a PWM dimmer for RGB LED: In my last post I’ve described the design and construction of my LED dimmer project. This project here is similar but a bit more involved. It controls RGB LEDs so it can not only change the brightness but also...

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App note: LED back light driving methods

Sunday, February 28th, 2016

Using pulse width modulation scheme for LCD back lighting an app note from Hantronix. Link here (PDF) LED back lights on LCD modules are generally driven with a dc voltage through a current limiting resistor. This simple approach is perfectly acceptable for most applications. When the primary consideration is an...

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Posted in app notes | 3 Comments »

PWM dimmer for LED lighting

Friday, February 19th, 2016

Lukas Fassler has published a new build, a DIY PWM dimmer for LED lighting: I have recently moved to a new apartment and was looking for a PWM dimmer to control some 12V LED strips. I thought that should be easy enough nowadays but it proved more difficult than I thought. All...

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Generating PWM signals

Saturday, December 26th, 2015

KF5OBS writes, "In this video I'm showing how to generate a PWM signal that's behaving proportionally to analog control signal." Details at KF5OBS' blog.

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DIY PWM to PPM converter for 2.4GHz receiver using Arduino

Wednesday, September 2nd, 2015

A DIY PWM to PPM converter using an Arduino Pro Mini from Al Prettybong.  Oscar wrote a post on his blog detailing how Al made it: For radio receiver, there are a few output signal formats. The traditional and also most common type of RX signal is the PWM and...

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Simple PWM generator with TR only

Friday, August 28th, 2015

Ondřej Karas writes,  "One year ago, I published two posts about PWM module driven by IQRF. But there is also another way, how to generate PWM signal from IQRF TR module only. Just simple use PIC peripherals. This post is based on one of Advanced examples, which is part of...

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App note: Accurate, fast settling analog voltages from digital PWM signals

Sunday, June 28th, 2015

Accurate, fast settling analog voltages from digital PWM signals, app note from Linear Technology (PDF!): Pulse width modulation (PWM) is a common technique for generating analog voltages from a digital device such  as a microcontroller or FPGA. Most microcontrollers have dedicated PWM generation peripherals built in, and  it only takes...

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UC3844 base motor speed controller

Wednesday, June 24th, 2015

Dilshan Jayakody writes: UC3844 is popular current mode controller which is commonly found on DC-to-DC converter circuits and switch mode power supplies. This motor speed controller is also based on UC3844 and it is specifically design to drive 20V - 24V DC motors. In this given configuration UC3844 produces (approx.)...

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App note: High-Precision 16-Bit PWM

Friday, June 12th, 2015

Technical brief from Microchip on their high-precision 16-Bit PWM modules found on various PIC16 devices. PDF link here The high-precision 16-bit PWM available in various PIC16 devices such as the PIC16F1574, delivers advanced features beyond those found on standard PWM modules. These innovative features allow the user to easily vary...

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Posted in app notes | 7 Comments »

AVR timer-based one shot explained

Monday, March 23rd, 2015

Josh writes: Last time, we made one-shot pulses using the AVR’s built in hardware timer module. Today we are going to dive deep into the datasheets to see how this technique is able to coax the normally free-running timer into generating a single pulse. Along the way, we will learn...

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Driving a DC motor using PWM with AVR ATmega

Monday, February 2nd, 2015

Davide Gironi writes: The PWM frequency have to be selected in the way that the switch frequency is much higher than the dynamics of the motor. To avoid noise from the motor, the choosen PWM frequency is 20Khz. Which is a know to know frequency. So, with this one, you...

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PWM Based LED Driver

Monday, December 22nd, 2014

A followup to the constant current driver for a high power LED post, Elmars writes: If anybody is interesed, I have posed a follow up to this original post with a simple PWM LED driver, adding an ATtiny85 mCU. The post includes schematic, board layout and code for the ATtiny85. I...

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Posted in LEDs | 12 Comments »

On Arduino due PWM frequency

Monday, September 22nd, 2014

Kerry D. Wong writes: I just got myself a couple of Arduino Due boards. While they were released almost two years ago, I have not really got a chance to look at these until quite recently. Arduino Due is based on Atmel’s ATSAM3x8E 32-bit ARM Cortext-M3 processor. The processor core...

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Posted in Arduino, AVR | 3 Comments »

Wireless servo controller II

Friday, September 5th, 2014

Ondřej Karas of DoItWireless writes: We described simple method, how to drive modellers servo. Today, we are going to try to drive this servo from potentiometer connected to TR module ADC. It is reaction to forum thread where is discussion about airplane model control possibility. Check out the video after the...

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App note: Using the AVR’s High-speed PWM

Saturday, July 26th, 2014

Atmel's app note on using the AVR’s High-speed PWM (PDF!): This application note is an introduction to the use of the high-speed Pulse Width Modulator (PWM) available in some AVR microcontrollers. The assembly code example provided shows how to use the fast PWM in the ATtiny26. The ATtiny15 also features a high-speed...

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Precise analog voltage from PWM

Monday, March 17th, 2014

Destate9  writes: So I've been trying to make a constant current H-bridge circuit for a project, and I'm running into trouble with PWM. Right now, all I have connected to the Output compare pin of my PIC32MX microcontroller is a 330uF capacitor (Max ESR of 1.4 ohms according to datasheet)....

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Posted in measurement | 3 Comments »

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Recent Comments

  • Noy: Yuuup
  • KH: I guess this is a failed attempt at making a pass/fail cable tester out of discrete ICs. A single pass/fail LED is not that useful....
  • Max: Considering it only seems to test that all wires conduct, I'm not sure what exactly does this show you that 7 LEDs each powered through...
  • David: Please
  • Dan: Such comment. Wow.