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1. Introduction
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This free Tool is a simple frequency sweeper with 5V square wave output (Duty cycle 50%, effective frequency range from over 10kHz (max 50kHz) to 50Hz) . This tool can be also considered as a MCU version of the software TMS-374 Decoder ECU. The only difference between this two tools is, that the MCU version works without a PC. A small tiny2313 MCU is used to generate the pulses instead of the PC RS232 Tx line. The TMS 374 software is in fact a simple frequency sweeper with an effective range from about 2000Hz to about 100Hz. The Tiny sweeper does exactly the same but much more better (bigger range and is for free).
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2. Manual
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After powering the device on - the LED should blink twice. Pressing the button will start the sweep procedure. LED ON - means there are pulses on the output. After reaching the lowest frequency the LED goes off and the mcu stops the generation.
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3. Hardware
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The schematic and bin files can be found in this folder or on www.tmw.netlook.pl. It's a typical tiny 2313 application with external 20 MHz crystal oscilator.
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4. Disclaimer / Support
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- This project is for free. 
- You're using this tool on your own discretion.
- As this tool is for free, we don't give a support.
- TMW electronic is the author and owner of this project.
- You can not sell product based on this project!
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5. TMS-374 Decoder ECU info
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The sweeper should work with the following ECUs: (It's a list from the TMS-374 Decoder ECU software)
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Renault SIEMENS Fenix 3 and 5
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Renault Megane 1400cc 8v
Renault Megane 1600cc 8v
Renault Megane 2000cc 8v
Renault Megane 2000cc 16V
Renault Megane Scenic 1400cc 8v
Renault Megane Scenic 1600cc 8v
Renault Megane Scenic 2000cc 8v
Renault Sefrane 2000cc 16V
Renault Laguna 2000cc 8v
Renault Laguna 2000cc 16v
Renault Espace 2000cc 8v
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Renault SAGEM SAFIR 1 and  2
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Renault Clio 1200cc 8V
Renault Clio 1400cc 8V
Renault Clio 1600cc 8V
Renault Clio 2000cc 16V Williams
Renault Laguna 1800cc 8V
Renault Laguna 2000cc 8V
Renault Laguna 1800cc 16V
Renault Laguna 2000cc 16V
Renault Twingo 1200cc 8V 
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Sagem SL96 Psa
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Peugeot 306 1400cc 8V
Peugeot 306 1600cc 16V
Peugeot 306 1800 16V
Peugeot Ranch 1400 8V
Citroen Berlingo 1400cc 8V
Citroen Xrara 1400cc 8V
Citroen Xrara 1800cc 16V 
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DAEWOO SIEMENS
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Daewoo Matiz  800cc
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HYUNDAI SIEMENS
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Hyundai Coupe 1600cc 16V
Hyundai Coupe 2000cc 16V 
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KIA SIEMENS
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Kia Rio 1300 16V
Kia Rio 1500 16V 
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MAGNETI MARELLI
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1AP20, 1AP40, 1AP41, 1AP43, 1AP80, 1AP81, 1AP83 1AP90,
Citroen Berlingo 1800cc 8V
Citroen Saxo 1400cc 8V
Citroen Saxo 1600cc 16V
Citroen Xara 1400cc 8V
Citroen Xara 1800cc 8V
Citroen Xara 2000cc 16V
Citroen ZX 1400cc 8V
Peugeot 106 1400cc 8V
Peugeot 106 1600cc 8V
Peugeot 106 1600cc 16V
Peugeot 206 1100cc 8V
Peugeot 206 1400cc 8V
Peugeot 306 1400cc 8V
Peugeot 306 1600cc 8V
Peugeot 306 1800cc 8V
Peugeot 405 1800cc 8V
Peugeot 406 1800cc 8V
Peugeot Partner 1800 8V