0.1.0 I2C_ABP2

Author: RobTillaart

libraries/I2C_ABP2/.arduino-ci.yml

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+platforms:
+  rpipico:
+    board: rp2040:rp2040:rpipico
+    package: rp2040:rp2040
+    gcc:
+      features:
+      defines:
+        - ARDUINO_ARCH_RP2040
+      warnings:
+      flags:
+
+packages:
+  rp2040:rp2040:
+    url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    - uno
+    # - due
+    # - zero
+    # - leonardo
+    - m4
+    - esp32
+    - esp8266
+    # - mega2560
+    - rpipico
+
+  libraries:
+    - "printHelpers"

libraries/I2C_ABP2/.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: RobTillaart
+custom: "https://www.paypal.me/robtillaart"

libraries/I2C_ABP2/.github/workflows/arduino-lint.yml

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+name: Arduino-lint
+
+on: [push, pull_request]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v6
+      - uses: arduino/arduino-lint-action@v2
+        with:
+          library-manager: update
+          compliance: strict

libraries/I2C_ABP2/.github/workflows/arduino_test_runner.yml

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+name: Arduino CI
+
+on: [push, pull_request]
+
+jobs:
+  runTest:
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+      - run: |
+          gem install arduino_ci
+          arduino_ci.rb

libraries/I2C_ABP2/.github/workflows/jsoncheck.yml

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+name: JSON check
+
+on:
+  push:
+    paths:
+      - '**.json'
+  pull_request:
+    paths:
+      - '**.json'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v6
+      - name: json-syntax-check
+        uses: limitusus/json-syntax-check@v2
+        with:
+          pattern: "\\.json$"

libraries/I2C_ABP2/CHANGELOG.md

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+# Change Log I2C_ABP2
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+
+## [0.1.0] - 2026-05-27
+- initial version
+

libraries/I2C_ABP2/I2C_ABP2.cpp

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+//
+//    FILE: I2C_ABP2.cpp
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+//    DATE: 2026-05-27
+// PURPOSE: Arduino library for the Honeywell I2C ABP2 pressure sensors.
+//     URL: https://github.com/RobTillaart/I2C_ABP2
+//          https://github.com/RobTillaart/pressure   (conversions)
+
+
+
+#include "I2C_ABP2.h"
+
+
+I2C_ABP2::I2C_ABP2(uint8_t address, TwoWire *wire)
+{
+  _address  = address;
+  _wire     = wire;
+  _error    = 0;
+  _lastRead = 0;
+  _Bar      = 0;
+  _celsius  = 0;
+}
+
+
+bool I2C_ABP2::begin(float minBar, float maxBar)
+{
+  _minBar = minBar;
+  _maxBar = maxBar;
+  //  reset variables
+  _error    = 0;
+  _lastRead = 0;
+  _Bar      = 0;
+  _celsius  = 0;
+
+  if (! isConnected())
+  {
+    return false;
+  }
+  return true;
+}
+
+
+bool I2C_ABP2::isConnected()
+{
+  _wire->beginTransmission(_address);
+  return (_wire->endTransmission() == 0);
+}
+
+
+uint8_t I2C_ABP2::getAddress()
+{
+  return _address;
+}
+
+
+/////////////////////////////////////////////
+//
+//  ASYNC INTERFACE
+//
+//  par 6.8 datasheet
+//  split into an ASYNC interface
+//
+int I2C_ABP2::request()
+{
+  uint8_t readCommand[3] = { 0xAA, 0x00, 0x00 };
+  _wire->beginTransmission(_address);
+  _wire->write(readCommand, 3);
+  _error = _wire->endTransmission();
+  if (_error != 0) return _error;
+
+  _error = I2C_ABP2_OK;
+  return _error;
+}
+
+int I2C_ABP2::read()
+{
+  //  read data
+  if (7 != _wire->requestFrom((uint8_t)_address, (uint8_t)7))
+  {
+    return I2C_ABP2_REQUEST_ERROR;
+  }
+  //  get state
+  _state = _wire->read();
+  //  get pressure
+  uint32_t rawP = 0;
+  for (int i = 0; i < 3; i++)
+  {
+    rawP <<= 8;
+    rawP += _wire->read();
+  }
+  const float maxCnt = 15099494.0;
+  const float minCnt = 1677722.0;
+  _Bar = ((rawP - minCnt) * (_maxBar - _minBar)) / (maxCnt - minCnt) + _minBar; 
+  //  get temperature
+  uint32_t rawT = 0;
+  for (int i = 0; i < 3; i++)
+  {
+    rawT <<= 8;
+    rawT += _wire->read();
+  }
+  _celsius = rawT * (200.0 / 16777215.0) - 50;
+  _lastRead = millis();
+  _error = I2C_ABP2_OK;
+  return _error;
+}
+
+
+/////////////////////////////////////////////
+//
+//  DEBUG
+//
+int I2C_ABP2::getLastError()
+{
+  int e = _error;
+  _error = 0;
+  return e;
+}
+
+
+///////////////////////////////////////////////
+//
+//  PRIVATE
+//
+
+
+//  -- END OF FILE --
+

libraries/I2C_ABP2/I2C_ABP2.h

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+#pragma once
+//
+//    FILE: I2C_ABP2.h
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+//    DATE: 2026-05-27
+// PURPOSE: Arduino library for the Honeywell I2C ABP2 pressure sensors.
+//     URL: https://github.com/RobTillaart/I2C_ABP2
+//          https://github.com/RobTillaart/pressure   (conversions)
+//
+//  https://forum.arduino.cc/t/honeywell-abp2-sensor-is-not-responding/1446097
+
+
+#include "Arduino.h"
+#include "Wire.h"
+
+
+#define I2C_ABP2_LIB_VERSION         (F("0.1.0"))
+
+//  ERROR CODES
+//  values <> 0 are errors.
+constexpr int I2C_ABP2_OK            = 0;
+constexpr int I2C_ABP2_NOT_READY     = -100;
+constexpr int I2C_ABP2_REQUEST_ERROR = -101;
+
+//  TODO state fields.
+
+
+class I2C_ABP2
+{
+public:
+  I2C_ABP2(uint8_t address, TwoWire *wire = &Wire);
+
+  bool     begin(float minBar, float maxBar);
+  bool     isConnected();
+  uint8_t  getAddress();
+
+  //  async interface
+  int      request();
+  int      read();
+  //  timestamp of last good read
+  uint32_t lastRead()    { return _lastRead; };
+
+  //  access last good read values.
+  uint8_t  getState()    { return _state; };
+  float    getBar()      { return _Bar;   };
+  float    getMilliBar() { return _Bar * 1e3;  };
+  float    getCelsius()  { return _celsius; };
+
+  //       DEBUG
+  int      getLastError();
+
+
+private:
+  uint8_t  _address;
+  TwoWire* _wire;
+
+  uint32_t _lastRead;
+  float    _minBar = 0;
+  float    _maxBar = 1;
+  float    _Bar;
+  uint8_t  _state;
+  float    _celsius;
+
+  int      _error;
+};
+
+
+//  -- END OF FILE --
+
+
+
+
+

libraries/I2C_ABP2/LICENSE

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+MIT License
+
+Copyright (c) 2026-2026 Rob Tillaart
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.