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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.

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Errata Sheet
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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
1.0.0 121 KB

Bill of Materials

Description Version Size
1.0.0 8 KB

Schematic Pack

Description Version Size
STEVAL-IHM041V1 schematics
1.0.0 119 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STSW-IHM041V1 STEVAL-IHM041V1 firmware

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: 2014-12-20
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA10

(*) 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.
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