78 lines
3.8 KiB
Markdown
78 lines
3.8 KiB
Markdown
# DCC-Lokdecoder
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## Description
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DCC multifunction decoder for H0 locomotives
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## Features
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- 1 motor H-bridge output
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- 3.6 A peak current
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- PWM frequency configurable (1-40 kHz)
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- overcurrent and temperature protected
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- 10 function outputs
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- 115 mA per output
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- F0f, F0r, AUX1 and AUX2 are dimmable *todo*
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- mappable to F0-F12 function keys
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- DCC asymmetry can be detected (for automatic brake control) *todo*
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## Hardware
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- 4-layer PCB esigned in KiCAD
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- fairly standard components (available from Digi-Key, Farnell, Mouser, etc...)
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- hand solderable (I did it too)
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- 4 debug LEDs (red, yellow, green and blue)
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| :---: | :---: |
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| top side | bottom side |
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## Firmware
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- Arduino compatible programming (behaves like an UNO)
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- DCC decoding by [NmraDcc](https://github.com/mrrwa/NmraDcc) library
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## JMRI integration
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| :---: | :---: | :---: | :---: | :---: | :---: |
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| Basic | Motor | Basic speed control | Speed table | Function map | Advanced |
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## Install guide
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1. Get the PCB (e.g. [JLCPCB](https://jlcpcb.com/)) and the components (e.g. [mouser](https://www.mouser.at/), [digikey](https://www.digikey.at/))
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2. Solder the components. The SOIC with exposed pad is a bit tricky, it can be soldered from the other side with a big tip and a lot of flux.
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3. Install the Arduino bootloader using the pads 5V, GND, SCK, MISO, MOSI, RST and an Arduino. [Arduino as ISP](https://www.arduino.cc/en/Tutorial/BuiltInExamples/ArduinoISP)
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4. Uncomment the line `#define RESET_FACTORY_DEFAULTS` to fill the EEPROM with the default CV values
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5. Upload the code using the pads 5V, GND, RX, TX, DTR and a USB TTL UART cable [like this](https://www.mouser.at/ProductDetail/FTDI/TTL-232R-5V-WE/?qs=OMDV80DKjRpCUAS6UR9QpQ%3D%3D)
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6. Re-comment the line `#define RESET_FACTORY_DEFAULTS` to avoid resetting to factory defaults every time.
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7. Upload the code again.
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8. Add the decoder XML file to JMRI. In DecoderPro select "File-> Import Decoder File..." and browse to the decoder [XML](JMRI_decoder_file/Public_Domain_GTI_green.xml). It will take some time, then adds the decoder definition to the database.
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9. Connect the T1 and T2 pads to the programming track of your DCC system.
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10. Add new locomotive with the "New Loco" button and then "Read type from decoder". It should detect the correct type:
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11. If everything is fine, you can install the decoder into your locomotive!
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### Pinout
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| Pad | Function |
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| :-- | :-- |
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| M1 | Motor 1 |
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| M2 | Motor 2 |
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| T1 | Track 1 |
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| T2 | Track 2 |
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| V+ | Positive common for function outputs (keep-alive capacitor positive) |
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| F0f | F0 function output forward (open drain) |
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| F0r | F0 function output reverse (open drain) |
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| AUXn | AUX function output n (open drain) |
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| 5V | internal microcontroller +5V supply |
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| GND | ground (keep alive capacitor negative) |
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| SCK | ISP programming clock (connect to ISP SCK) |
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| MISO | ISP programming read (connect to ISP MISO) |
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| MOSI | ISP programming write (connect to ISP MOSI) |
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| RST | ISP programming reset (connect to ISP reset output)
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| RX | serial programming receive (connect to TTL UART TX) |
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| TX | serial programming transmit (connect to TTL UART RX) |
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| DTR | serial programming reset through a 100 nF capacitor (connect to TTL UART DTR) |
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## Todo list
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- [ ] CV15, CV16 decoder locking
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- [ ] CV65 kick start
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- [ ] CV67-94 speed table
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- [ ] CV27 automatic brake control
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- [ ] function output dimming
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- [ ] motor fault check
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