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Universal motor driver with speed control based on the STM8 and Triac (US version)
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The STEVAL-IHM041V1 demonstration board is a Triac-based phase angle control for universal motor speed control using an STM8S103F3P6, 8-bit microcontroller, to set the conduction angle of the Triac.

The STEVAL-IHM041V1 demonstration board may be operated in either open loop mode or in closed loop speed control mode, with an AC tach, Hall sensor or opto-sensor feedback.

The open loop mode may also be used as a lamp dimmer.

The STEVAL-IHM041V1 demonstration board is designed to operate from a 120 V/60 Hz mains, but may be easily modified to operate on other mains voltages by changing components in the power supply and motor voltage sensing circuits. Suggested component values for 230 V/50 Hz mains voltages are shown in the relevant bill of materials.

pdf Please read
Errata Sheet
pdf Download

Key Features

  • Input voltage 120 V/60 Hz
  • Motor current: 7 A RMS
  • Phase control for universal motor drive
  • Open loop or closed loop speed regulation
  • Voltage and current sensing, for sensorless operation (optional)
  • Debug outputs
  • AC tach, Hall sensor or opto-sensor for speed feedback
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS9158: Universal motor driver with speed control based on the STM8 and Triac (US version)
1.0 276 KB

User Manual

Description Version Size
UM1559: STEVAL-IHM041V1: hardware description
1.0 525 KB
UM1596: STM8® based universal motor control example software
1.0 85 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-IHM041V1 gerber files
1.0 121 KB

Bill of Materials

Description Version Size
1.0 8 KB

Schematic Pack

Description Version Size
STEVAL-IHM041V1 schematics
1.0 119 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STSW-IHM041V1 STEVAL-IHM041V1 firmware

Publications and Collaterals


Description Version Size
Products and Solutions for Factory Automation and Control
Jan 2015 3,105 KB

License Agreement

Description Version Size
Evaluation products license agreement
1.0 126 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-IHM041V1ActiveSTM8S103F3; T1635T-8IBuy Direct67.37Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA20

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.