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Twizy-ChargeThrottle V1.0 (initial release)
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assets
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*.html
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README.md
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README.md
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# TwizyChargeThrottle
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This is a very simple tool to limit the Twizy charge current if you don't have an OVMS.
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It can currently only limit the charge current to a fixed level (defined in the config file).
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The Arduino needs to be connected to the Twizy CAN bus during the charge process to be able
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to actively overwrite the charge current control frames.
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Note: using an interrupt capable CAN shield is highly recommended.
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## Info
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Author: Michael Balzer <dexter@dexters-web.de>
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Libraries used:
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- MCP_CAN: https://github.com/coryjfowler/MCP_CAN_lib
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This is free software under GNU Lesser General Public License (LGPL)
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https://www.gnu.org/licenses/lgpl.html
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TwizyChargeThrottle/TwizyChargeThrottle.ino
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TwizyChargeThrottle/TwizyChargeThrottle.ino
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/**
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* ==========================================================================
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* Twizy charge current throttle
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* ==========================================================================
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*
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* Author: Michael Balzer <dexter@dexters-web.de>
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*
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* Libraries used:
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* - MCP_CAN: https://github.com/coryjfowler/MCP_CAN_lib
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*
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* License:
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* This is free software under GNU Lesser General Public License (LGPL)
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* https://www.gnu.org/licenses/lgpl.html
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*
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*/
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#define TWIZY_CT_VERSION "V1.0 (2019-05-10)"
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#include <mcp_can.h>
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#include <mcp_can_dfs.h>
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#include "TwizyChargeThrottle_config.h"
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// CAN interface:
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MCP_CAN CAN(TWIZY_CAN_CS_PIN);
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// CAN msg buffer:
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unsigned long msgId;
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byte msgLen;
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byte msgBuf[8];
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// Operation mode:
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bool charging = false;
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// Current level:
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byte level = 0;
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#if TWIZY_CAN_IRQ_PIN > 0
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volatile bool msgReceived = false;
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void canISR() {
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msgReceived = true;
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}
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#endif
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void setup() {
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Serial.begin(SERIAL_SPEED);
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Serial.println(F("TwizyChargeThrottle " TWIZY_CT_VERSION));
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// Init CAN interface:
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#if TWIZY_CAN_IRQ_PIN > 0
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pinMode(TWIZY_CAN_IRQ_PIN, INPUT);
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attachInterrupt(digitalPinToInterrupt(TWIZY_CAN_IRQ_PIN), canISR, FALLING);
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#endif
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while (CAN.begin(MCP_STDEXT, CAN_500KBPS, TWIZY_CAN_MCP_FREQ) != CAN_OK) {
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Serial.println(F("Setup: waiting for CAN connection..."));
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delay(1000);
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}
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// Set ID filters:
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CAN.init_Mask(0, 0, 0x07FF0000);
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CAN.init_Filt(0, 0, 0x01550000); // BMS → BMS: current control
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CAN.init_Filt(1, 0, 0x05970000); // CHG → BMS: operation mode
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CAN.init_Mask(1, 0, 0x07FF0000);
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CAN.init_Filt(2, 0, 0x00000000);
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CAN.init_Filt(3, 0, 0x00000000);
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CAN.init_Filt(4, 0, 0x00000000);
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CAN.init_Filt(5, 0, 0x00000000);
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CAN.setMode(MCP_NORMAL);
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Serial.println(F("Setup done."));
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Serial.print(F("Throttling configured to current level: "));
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Serial.println((char)('0' + TWIZY_CHARGE_THROTTLE));
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}
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void loop() {
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while (true) {
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#if TWIZY_CAN_IRQ_PIN > 0
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// Wait for interrupt signal:
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while (!msgReceived);
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msgReceived = false;
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#endif
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// Process CAN read buffer:
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while (CAN.readMsgBuf(&msgId, &msgLen, msgBuf) == CAN_OK)
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{
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if (msgId == 0x597)
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{
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// ID 0x597: operation mode
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bool _charging = ((msgBuf[1] & 0x60) == 0x20);
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#if TWIZY_DEBUG > 0
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if (_charging && !charging)
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Serial.println(F("Charge START"));
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else if (!_charging && charging)
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Serial.println(F("Charge STOP"));
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#endif
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charging = _charging;
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level = 0;
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}
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else if (charging)
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{
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// ID 0x155: charge current control
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byte _level = msgBuf[0];
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if (_level == 0xFF)
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continue; // init phase, skip
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if (_level > TWIZY_CHARGE_THROTTLE)
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{
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// overwrite:
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msgBuf[0] = TWIZY_CHARGE_THROTTLE;
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CAN.sendMsgBuf(0x155, 0, 8, msgBuf);
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}
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#if TWIZY_DEBUG > 1
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if (_level != level)
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{
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Serial.print(F("Level "));
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if (_level > TWIZY_CHARGE_THROTTLE) {
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Serial.print((char)('0' + _level));
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Serial.print('>');
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Serial.println((char)('0' + TWIZY_CHARGE_THROTTLE));
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} else {
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Serial.println((char)('0' + _level));
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}
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}
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#endif
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level = _level;
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}
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}
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} // while (true)
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}
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36
TwizyChargeThrottle/TwizyChargeThrottle_config.h
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TwizyChargeThrottle/TwizyChargeThrottle_config.h
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/**
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* ==========================================================================
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* Twizy charge current throttle
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* ==========================================================================
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*/
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#ifndef _TwizyChargeThrottle_config_h
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#define _TwizyChargeThrottle_config_h
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// Set the charge current throttle level here:
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// 6 = 30 A = 2,1 kW
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// 5 = 25 A = 1,7 kW
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// 4 = 20 A = 1,4 kW
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// 3 = 15 A = 1,0 kW
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// 2 = 10 A = 0,7 kW
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// 1 = 5 A = 0,4 kW
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#define TWIZY_CHARGE_THROTTLE 5
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// Serial debug output level:
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// 1 = show charge start/stop
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// 2 = show current level changes
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#define TWIZY_DEBUG 2
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// Serial interface baud rate:
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#define SERIAL_SPEED 115200
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// Set your CAN MCP clock frequency here:
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#define TWIZY_CAN_MCP_FREQ MCP_16MHZ
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// Set your CAN CS pin number here:
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#define TWIZY_CAN_CS_PIN SS
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// Set your CAN IRQ pin here (0 = no IRQ):
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#define TWIZY_CAN_IRQ_PIN 2
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#endif // _TwizyChargeThrottle_config_h
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