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Add DiFluid Microbalance BLE scale support #3

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aec538e
Add DiFluid Microbalance (cleartext AA01) scale support
FabianSperrle May 24, 2026
9225ad0
Document DiFluid Microbalance in README compatibility table
FabianSperrle May 24, 2026
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3 changes: 3 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@ This is an Arduino Library which can be found in the Arduino IDE Library Manager
| Acaia | Pyxis | ---- | v1.0.022 | Good | Not Recommended (too sensitive) | Yes | Yes
| Bookoo | Themis Mini | ---- | v1.0.5 | Great | Yes | Yes | Yes
| Bookoo | Themis Ultra | ---- | ---- | Great | Yes | Yes | Yes
| DiFluid | Microbalance | ---- | ---- | Good | Yes | No (not implemented) | No (not implemented)


## Requirements
Expand Down Expand Up @@ -120,6 +121,8 @@ Scale Compatibility:

☑ Bookoo

☑ DiFluid Microbalance

Hardware:

☑ PCB Design for Low Voltage Switches (V1.1)
Expand Down
81 changes: 76 additions & 5 deletions src/AcaiaArduinoBLE.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,10 @@ const byte START_TIMER_WEIGHMYBRU[4] = {0x03, 0x0a, 0x02, 0x01};
const byte STOP_TIMER_WEIGHMYBRU[4] = {0x03, 0x0a, 0x03, 0x01};
const byte RESET_TIMER_WEIGHMYBRU[4] = {0x03, 0x0a, 0x04, 0x01};

// DiFluid Microbalance (cleartext AA01). Checksum byte = sum(all prior bytes) & 0xFF.
const byte DIFLUID_AUTOSEND_ON[7] = {0xDF, 0xDF, 0x01, 0x00, 0x01, 0x01, 0xC1}; // Func1/Cmd0 Auto Send = On
const byte TARE_DIFLUID[7] = {0xDF, 0xDF, 0x03, 0x02, 0x01, 0x01, 0xC5}; // Func3/Cmd2 single-click power btn

// Static instance for callback
AcaiaArduinoBLE *AcaiaArduinoBLE::_instance = nullptr;

Expand Down Expand Up @@ -80,7 +84,8 @@ bool MyAdvertisedDeviceCallbacks::isSupportedScale(const String &name) {
return normalizedName.startsWith("ACAIA") || normalizedName.startsWith("LUNAR") || normalizedName.
startsWith("PYXIS") || normalizedName.startsWith("PEARL") || normalizedName.startsWith("CINCO") ||
normalizedName.startsWith("PROCH") || normalizedName.startsWith("BOOKOO") || normalizedName.
startsWith("DECENT") || normalizedName.startsWith("ESPRESSISCALE") || normalizedName.startsWith("WEIGHMYBRU");
startsWith("DECENT") || normalizedName.startsWith("ESPRESSISCALE") || normalizedName.startsWith("WEIGHMYBRU") ||
normalizedName.startsWith("MICROBALANCE"); // DiFluid Microbalance / Microbalance Ti
}

void MyClientCallback::onConnect(NimBLEClient *pclient) {
Expand Down Expand Up @@ -466,6 +471,18 @@ bool AcaiaArduinoBLE::updateConnection() {
}
}

// Try DiFluid Microbalance (cleartext AA01 channel; FF01 in the same service is encrypted)
if (!pService) {
pService = _pClient->getService(NimBLEUUID(SUUID_DIFLUID));

if (pService) {
_type = DIFLUID;
_pWriteCharacteristic = pService->getCharacteristic(NimBLEUUID(CHAR_DIFLUID));
_pReadCharacteristic = pService->getCharacteristic(NimBLEUUID(CHAR_DIFLUID));
if (_debug) Serial.println("DiFluid Microbalance detected");
}
}

if (pService && _pWriteCharacteristic && _pReadCharacteristic) {
if (_debug) Serial.println("Service and characteristics found");
_connectionState = CONFIGURING;
Expand Down Expand Up @@ -508,8 +525,8 @@ bool AcaiaArduinoBLE::updateConnection() {
break;
}

// Send identify command (except for GENERIC scales)
if (_type != GENERIC) {
// Send identify command (except for GENERIC and DiFluid scales)
if (_type != GENERIC && _type != DIFLUID) {
if (!_pWriteCharacteristic->writeValue(IDENTIFY, 20, false)) {
if (_debug) Serial.println("Failed to send identify command");
_connectionState = FAILED;
Expand All @@ -521,8 +538,8 @@ bool AcaiaArduinoBLE::updateConnection() {
delay(200); // Give the scale time to process
}

// Send notification request (except for GENERIC scales)
if (_type != GENERIC) {
// Send notification request (except for GENERIC and DiFluid scales)
if (_type != GENERIC && _type != DIFLUID) {
if (!_pWriteCharacteristic->writeValue(NOTIFICATION_REQUEST, 14, false)) {
if (_debug) Serial.println("Failed to send notification request");
_connectionState = FAILED;
Expand All @@ -534,6 +551,19 @@ bool AcaiaArduinoBLE::updateConnection() {
delay(200); // Give the scale time to process
}

// DiFluid: enable cleartext weight auto-send on AA01 (write-with-response, no heartbeat needed)
if (_type == DIFLUID) {
if (!_pWriteCharacteristic->writeValue(DIFLUID_AUTOSEND_ON, sizeof(DIFLUID_AUTOSEND_ON), true)) {
if (_debug) Serial.println("Failed to enable DiFluid auto-send");
_connectionState = FAILED;
_connectionStartTime = millis();
break;
}

if (_debug) Serial.println("DiFluid auto-send enabled");
delay(200); // Give the scale time to process
}

_connected = true;
_lastPacket = 0;
_connectionState = CONNECTED;
Expand Down Expand Up @@ -715,6 +745,9 @@ void AcaiaArduinoBLE::tare() {
else if (_type == WEIGHMYBRU) {
_pWriteCharacteristic->writeValue(TARE_WEIGHMYBRU, sizeof(TARE_WEIGHMYBRU), false);
}
else if (_type == DIFLUID) {
_pWriteCharacteristic->writeValue(TARE_DIFLUID, sizeof(TARE_DIFLUID), true); // write-with-response
}
else {
_pWriteCharacteristic->writeValue(TARE_ACAIA, sizeof(TARE_ACAIA), false);
}
Expand All @@ -737,6 +770,9 @@ void AcaiaArduinoBLE::startTimer() const {
else if (_type == WEIGHMYBRU) {
_pWriteCharacteristic->writeValue(START_TIMER_WEIGHMYBRU, sizeof(START_TIMER_WEIGHMYBRU), false);
}
else if (_type == DIFLUID) {
// On-scale timer not implemented for DiFluid yet (command bytes unverified). No-op.
}
else {
_pWriteCharacteristic->writeValue(START_TIMER, sizeof(START_TIMER), false);
}
Expand All @@ -758,6 +794,9 @@ void AcaiaArduinoBLE::stopTimer() const {
else if (_type == WEIGHMYBRU) {
_pWriteCharacteristic->writeValue(STOP_TIMER_WEIGHMYBRU, sizeof(STOP_TIMER_WEIGHMYBRU), false);
}
else if (_type == DIFLUID) {
// On-scale timer not implemented for DiFluid yet (command bytes unverified). No-op.
}
else {
_pWriteCharacteristic->writeValue(STOP_TIMER, sizeof(STOP_TIMER), false);
}
Expand All @@ -779,6 +818,9 @@ void AcaiaArduinoBLE::resetTimer() const {
else if (_type == WEIGHMYBRU) {
_pWriteCharacteristic->writeValue(RESET_TIMER_WEIGHMYBRU, sizeof(RESET_TIMER_WEIGHMYBRU), false);
}
else if (_type == DIFLUID) {
// On-scale timer not implemented for DiFluid yet (command bytes unverified). No-op.
}
else {
_pWriteCharacteristic->writeValue(RESET_TIMER, sizeof(RESET_TIMER), false);
}
Expand Down Expand Up @@ -1053,6 +1095,35 @@ void AcaiaArduinoBLE::notifyCallback(const uint8_t *pData, size_t length) {
Serial.println(pData[0], HEX);
}
}
else if (_type == DIFLUID && length == 19
&& pData[0] == 0xDF && pData[1] == 0xDF
&& pData[2] == 0x03 && pData[3] == 0x00 && pData[4] == 0x0D) {
// DiFluid Microbalance cleartext sensor frame (19 bytes):
// DF DF 03 00 0D | W0 W1 W2 W3 | flow(2) | time(2) | timestamp(4) | unit | checksum
// Weight = signed big-endian int32 at offset 5, x0.1 g. Other AA01 frames (the Func1
// auto-send echo, and Func3/Cmd5 status with pData[3]==0x05) are excluded by the guards.
uint8_t calculated_checksum = 0;

for (size_t i = 0; i < length - 1; i++) { // sum checksum (NOT XOR)
calculated_checksum += pData[i];
}

if (calculated_checksum == pData[length - 1]) {
const auto raw = static_cast<int32_t>(
(static_cast<uint32_t>(pData[5]) << 24) | (static_cast<uint32_t>(pData[6]) << 16) |
(static_cast<uint32_t>(pData[7]) << 8) | static_cast<uint32_t>(pData[8]));
_currentWeight = raw / 10.0f; // grams (pData[17] = unit flag; assume grams)
newWeightPacket = true;

if (_debug) {
Serial.print("DiFluid scale weight: ");
Serial.println(_currentWeight, 1);
}
}
else if (_debug) {
Serial.println("DiFluid checksum mismatch - ignoring packet");
}
}

if (newWeightPacket) {
_newWeightAvailable = true;
Expand Down
8 changes: 7 additions & 1 deletion src/AcaiaArduinoBLE.h
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,11 @@
#define READ_CHAR_BOOKOO "ff11" // Same as GENERIC
#define WRITE_CHAR_WEIGHMYBRU "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
#define READ_CHAR_WEIGHMYBRU "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
// DiFluid Microbalance / Microbalance Ti: service 000000EE exposes two characteristics,
// AA01 = cleartext (DF DF protocol, used here) and FF01 = encrypted (ignored). AA01 is
// notify + write, so one characteristic serves as both read and write.
#define SUUID_DIFLUID "000000EE-0000-1000-8000-00805F9B34FB"
#define CHAR_DIFLUID "0000AA01-0000-1000-8000-00805F9B34FB"
#define HEARTBEAT_PERIOD_MS 2750
#define MAX_PACKET_PERIOD_MS 5000

Expand All @@ -44,7 +49,8 @@ enum scale_type {
GENERIC, // Felicita Arc, etc
DECENT, // Decent Scale + EspressiScale
BOOKOO, // Bookoo Themis and Themis Ultra
WEIGHMYBRU // WeighMyBru DIY scales
WEIGHMYBRU, // WeighMyBru DIY scales
DIFLUID // DiFluid Microbalance / Microbalance Ti (cleartext AA01 channel)
};

enum ConnectionState {
Expand Down