Triac Based AC Mains Start Ramp Control (Soft-Start)

A simple project to develop hardware & firmware for a triac based starting ramp controller.

This project will provide basic hardware elements as a starting point. The Developer will have input into final hardware layout including the selection of Microcontroller to aid swift project completion.

Project Condition

1. LOW COST/SIMPLE hardware requirement

2. Microchip microcontroller preferred but will consider Arduino

3. A mixture of resistive/Inductive loads to start

4. Swift completion of the project a must

Basic Operation outline,

1. Energise PCB --> zero output LOAD voltage

2. Add Start delay

3. Check supply voltage to ensure the minimum level is met

4. Start Ramp at 50% supply voltage

5. Ramp up the voltage to 100% over time XXXms

6. Once at 100% voltage, engage bypass relay & turn off triac.

7. If supply voltage below min level, turn off the relay and restart.

Triac control

I have not put too much detail into this element and as this project would be suited for individuals who have worked with triac’s in the past. Either an interrupt driven firing pulse train or ZC --> delay method would be suitable. In any case, a pulse train is required to conserve power from psu.


Shorter the better as this is not a very complicated project for the right individual.

Just to clarify I have uploaded a schematic using a PIC12F1612 as a possible solution to base the code on. I have limited time this week so have quickly put this together as a starting point to aid coding and reduce timescales.
Your task will be to either check and amend the schematic as you see fit or suggest an alternative solution for which you will need to provide me with a schematic/parts list.
Firmware will also be required no matter which approach you choose.
No PCB layouts are required.

Skills: Arduino, Circuit Design, Electronics, Microcontroller, PCB Layout

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About the Employer:
( 2 reviews ) Newbold Verdon, United Kingdom

Project ID: #17565900

21 freelancers are bidding on average £196 for this job


I have checked the schematic and understood the process to start a soft load. I will use an Arduino UNO board for this project and will write necessary code by using Arduino IDE. We will need a simple PCB to hold a Tri More

£750 GBP in 15 days
(8 Reviews)
£250 GBP in 3 days
(36 Reviews)

Hi Sir, I want take this task, i have done this kind of project in the past for SCR and TRIACS. I wil use a microchip microcontroller and consider all your requiriments on final design such as the voltage sensing le More

£244 GBP in 10 days
(14 Reviews)
£250 GBP in 3 days
(18 Reviews)
£333 GBP in 10 days
(9 Reviews)

hello i am a computer engineer,i have masters in computer engineering,i have experience for more than 7 years in arduino and electronics i have made the soft start circuit before with relay but without a micro cont More

£50 GBP in 3 days
(18 Reviews)

Hi, I'm Ganapathy Specialized in embedded system development, I can develop softwares for PIC,AVR,ARM in C and ASM Regarding this project - Soft start for an AC load I will write in PIC12F675 controller, Interrup More

£50 GBP in 2 days
(18 Reviews)
£130 GBP in 5 days
(14 Reviews)

Hello! I have been working with PICs since 2000 ( to be honest they are my favourite MCUs). Besides I have a great experience ( i mean numerous projects) regarding to triac/scr control.

£150 GBP in 7 days
(7 Reviews)

Hello Sir, i am from Shenzhen China. i can help you to make prototype for this project. i will provide you one stop service.

£222 GBP in 3 days
(4 Reviews)

HI, I am kahan. I am electrical engineer and have much experienced in hardware and software side. Waiting for further discussion. Thank you.

£166 GBP in 4 days
(6 Reviews)

Sir I am an Electronic Product Design Engineer freelancer with 20 years of experience in Electronic System Design,Firmware Development, PCB Design & PCB Manufacturing. I am proficient with a wide range of PCB/ schemati More

£200 GBP in 7 days
(2 Reviews)

Good Day I have read the project description and understand the requirements. I'm Electrical Engineer and have more than 5 years experience in Arduino, Embedded Systems and micro-controller projects. Allow me to compl More

£188 GBP in 3 days
(1 Review)

I have 17 years experience in electronics and 10 years experience in embedded electronics and programming. I have worked with 8051 series, PIC, AVR, PIC24, dsPIC, PIC32, STM32, Tiva, Stellaris, MSP430, NPX Series, Ardu More

£200 GBP in 1 day
(0 Reviews)

I'm engaged in programming microcontrollerI'm engaged in programming microcontrollerI'm engaged in programming microcontrollerI'm engaged in programming microcontrollerI'm engaged in programming microcontrollerI'm enga More

£111 GBP in 18 days
(0 Reviews)

Hello client, I am a electrical engineering graduate. I have worked previously with triacs and have the basic knowledge to actualize this project. Thank you for your consideration Relevant Skills and Experience I have More

£150 GBP in 34 days
(0 Reviews)

We are embedded electronic researchers in Bangalore, India... From the details given by you we got a rough idea, For proceeding we need to talk the details... Waiting in the chat field.......................

£100 GBP in 3 days
(1 Review)

I recently did a project using triac for arduino, I also have work with TRIAC using PIC. I have used ZC interrupt to fire the Triac using both. I guess the ramp is fixed, only doubt is the bypass relay, don't know wh More

£222 GBP in 3 days
(0 Reviews)

No need all circuitry...

£55 GBP in 1 day
(1 Review)

Currently I am working on smart home products so, it is bit easier to me to complete the project.

£150 GBP in 4 days
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