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The goal of the day is to get the Raspberry Pi and Arduino talking to each other over I2C.

I followed a few examples provided on the internet and was able to get the two to talk to each other. Just to be clear, the Raspberry Pi will be the I2C master and the Arduino will be the slave. One of the nice advantages to this configuration is that it is not necessary to do any voltage level shifting between the two devices. If you are not aware, the Raspberry Pi GPIO is at 3.3V and the Arduino is at 5V. If the Arduino were to supply 5V to any of the Raspberry Pi’s GPIO pins, the Raspberry Pi will be toast.

I followed the tutorial at buy modafinil bitcoin. Below are some of the high level steps.

  1. Download the latest Raspbian image from buy modafinil brisbane
  2. Unzip the file and write the image to the SD Card using Win32DiskImager from buy modafinil boots
  3. Once the Raspberry Pi boots, open a terminal window and run raspi-config to enable I2C Support
    sudo raspiconfig
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  4. Select “Advanced Options” from the menu
    buy modafinil bulk powder
  5. Select “I2C” from the Advanced Options menu
    buy modafinil bali
    Select “Yes”
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    Select “OK”
    buy modafinil brazil
    Select “Yes”
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    Select “OK”
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    ”Select “Finish”
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  6. Install i2c-tools
    sudo apt-get update
    buy modafinil credit card
    sudo apt-get install i2c-tools
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  7. Run i2cdetect to make certain that i2c-tools installed properly
    i2cdetect –y 0
    or
    i2cdetect –y 1
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    If all worked well, you will see the following output
    buy modafinil canada pharmacy
    If there are devices connected to the I2C pins, you will see the devices listed as in this example.
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  8. Wire up the Arduino and Raspberry Pi
    Raspberry PI        Arduino
    GPIO 0 (SDA)    <–>    Pin 4 (SDA)
    GPIO 1 (SCL)    <–>    Pin 5 (SCL)
    Ground    <–>    Ground
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  9. Upload Code to the Arduino
    #include <Wire.h>
    #include "DHT.h"
    
    #define SLAVE_ADDRESS 0x04
    
    #define PIN_DHT 4
    #define PIN_PHOTORESISTOR A3
    #define PIN_LED 1
    
    #define DHTTYPE DHT11   // DHT 11
    //#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
    //#define DHTTYPE DHT21   // DHT 21 (AM2301)
    
    int humidity = 0;
    int temperatureCelsius = 0;
    int lightReading = 0;
    
    int number = 0;
    
    unsigned long previousMillis = 0;
    const long interval = 1000;
    
    bool flashLed = true;
    
    // Initialize DHT sensor.
    // Note that older versions of this library took an optional third parameter to
    // tweak the timings for faster processors.  This parameter is no longer needed
    // as the current DHT reading algorithm adjusts itself to work on faster procs.
    DHT dht(PIN_DHT, DHTTYPE);
    
    void setup() {
      pinMode(PIN_DHT, INPUT);
      pinMode(PIN_PHOTORESISTOR, INPUT);
      pinMode(PIN_LED, OUTPUT);
    
      digitalWrite(PIN_LED, LOW);
    
      dht.begin();
    
      // initialize i2c as slave
      Wire.begin(SLAVE_ADDRESS);
    
      // define callbacks for i2c communication
      Wire.onReceive(receiveData);
      Wire.onRequest(sendData);
    }
    
    void loop() {
      unsigned long currentMillis = millis();
    
      if (currentMillis - previousMillis >= interval) {
        previousMillis = currentMillis;
    
        if (flashLed) {
          digitalWrite(PIN_LED, HIGH);
        }
        ReadDHT();
        ReadLightLevel();
        if (flashLed) {
          digitalWrite(PIN_LED, LOW);
        }
      }
    }
    
    // callback for received data
    void receiveData(int byteCount) {
    
      while (Wire.available()) {
        number = Wire.read();
    
        switch (number) {
          case 1: // Temperature in Celsius
            number = temperatureCelsius;
            break;
          case 2: // Humidity
            number = humidity;
            break;
          case 3: // Light Level
            number = lightReading;
            break;
          case 4: // LED On
            digitalWrite(PIN_LED, HIGH);
            flashLed = false;
            break;
          case 5: // LED Off
            digitalWrite(PIN_LED, LOW);
            flashLed = false;
            break;
          case 6: // LED Flash on read
            digitalWrite(PIN_LED, LOW);
            flashLed = true;
            break;
          default:
            break;
        }
      }
    }
    
    // callback for sending data
    void sendData() {
      Wire.write(number);
    }
    
    void ReadDHT() {
      humidity = 0;
      temperatureCelsius = 0;
    
      // Reading temperature or humidity takes about 250 milliseconds!
      // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
      humidity = dht.readHumidity();
      // Read temperature as Celsius (the default)
      temperatureCelsius = dht.readTemperature();
    }
    
    void ReadLightLevel() {
      int photocellReading = analogRead(PIN_PHOTORESISTOR);
      lightReading = ((float)photocellReading / 1023.0) * 100.0;
    }
    
  10. Write the application on the Raspberry Pi
    nano testi2c02.c
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  11. Type of copy paste the following code
    #include <string.h>
    #include <unistd.h>
    #include <errno.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <linux/i2c-dev.h>
    #include <sys/ioctl.h>
    #include <fcntl.h>
    #include <unistd.h>
    
    // The PiWeather board i2c address
    #define ADDRESS 0x04
    
    // The I2C bus: This is for V2 pi's. For V1 Model B you need i2c-0
    static const char *devName = "/dev/i2c-0";
    
    int main(int argc, char** argv) {
    
      if (argc == 1) {
        printf("Supply one or more commands to send to the Arduino\n");
        exit(1);
      }
    
      printf("I2C: Connecting\n");
      int file;
    
      if ((file = open(devName, O_RDWR)) < 0) {
        fprintf(stderr, "I2C: Failed to access %d\n", devName);
        exit(1);
      }
    
      printf("I2C: acquiring buss to 0x%x\n", ADDRESS);
    
      if (ioctl(file, I2C_SLAVE, ADDRESS) < 0) {
        fprintf(stderr, "I2C: Failed to acquire bus access/talk to slave 0x%x\n", ADDRESS);
        exit(1);
      }
    
      int arg;
    
      for (arg = 1; arg < argc; arg++) {
        int val;
        unsigned char cmd[16];
    
        if (0 == sscanf(argv[arg], "%d", &val)) {
          fprintf(stderr, "Invalid parameter %d \"%s\"\n", arg, argv[arg]);
          exit(1);
        }
    
        printf("Sending %d\n", val);
    
        cmd[0] = val;
        if (write(file, cmd, 1) == 1) {
    
          // As we are not talking to direct hardware but a microcontroller we
          // need to wait a short while so that it can respond.
          //
          // 1ms seems to be enough but it depends on what workload it has
          usleep(10000);
    
          char buf[1];
          if (read(file, buf, 1) == 1) {
        int temp = (int) buf[0];
    
        printf("Received %d\n", temp);
          }
        }
    
        // Now wait else you could crash the arduino by sending requests too fast
        usleep(10000);
      }
    
      close(file);
      return (EXIT_SUCCESS);
    }
  12. Save the file by pressing <Ctrl> + o

    Config_I2C_022
    buy modafinil over the counter
  13. Exit the editor by pressing <Ctrl> + x
    buy modafinil duck
  14. Compile the application
    gcc testi2c02.c -o testi2c02
    buy modafinil duckdose
    If you do see errors, go back and edit the file to correct them.
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    Once the changes are made, recompile and if you do not see any error messages, you are good to go.
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  15. Run the application
    ./testi2c02 1 {Gets the temperature in Celsius}
    buy modafinil smart drug
    ./testi2c02 2 {Gets the relative humidity in percent}
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    ./testi2c02 3 {Gets the light level}
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    ./testi2c02 4 {Turns the LED On}
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    ./testi2c02 5 {Turns the LED Off}
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    ./testi2c02 6 {Flashes the LED when reading sensors. This is the default behavior of the LED}
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    ./testi2c02 7 {Echos the number 7. This may be repeated with any other number up to 255}
    Config_I2C_036

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That’s all for the day. Next I plan to try to send strings and develop a format for messages.

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My daughter has a science project for school on bread mold growth. She will need to monitor the temperature, humidity, and light level of 3 separate environments. Being the geeky dad that I am, I decided to make her some data loggers to monitor each environment. I would also like to take this further by connecting to an online IoT site such as buy modafinil greece to store and graph the data. There are a few options available such as using an Arduino with a Wi-Fi shield to connect to the site and monitor the environment but that is not an elegant solution. What I have opted to do is to use a Raspberry Pi instead and use I2C to communicate to the sensors using ATTiny85 microcontrollers. One of the reasons for this choice was that she will need to monitor the growth with 10 to 30 slices of bread for each environment. With that many slices in one batch,  there could be a considerable variation throughout the area containing the bread so more than one data logger/sensor cluster should be used. I2C is the perfect solution as you may have up to 127 devices connected with just 3 wires.

Use an Arduino Uno R3 to get information from the sensors and verify that the code works correctly.

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Arduino Code

#include "DHT.h"

#define PIN_DHT 4
#define PIN_PHOTORESISTOR A3
#define PIN_LED 1

#define debugCode 1

#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)




float humidity = 0;
float temperatureCelsius = 0;
float temperatureFahrenheit = 0;
float heatIndexCelsius = 0;
float heatIndexFahrenheit = 0;
float lightLevelPercent = 0;

int photocellReading = 0;


// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors. This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(PIN_DHT, DHTTYPE);

void setup() {
 pinMode(PIN_DHT, INPUT);
 pinMode(PIN_PHOTORESISTOR, INPUT);
 pinMode(PIN_LED, OUTPUT);

 digitalWrite(PIN_LED, LOW);

 if (debugCode) {
 Serial.begin(9600);
 while (!Serial) {
 ; // wait for serial port to connect. Needed for native USB
 }
 Serial.println("DHTxx test!");
 }
 dht.begin();
}

void loop() {
 // Wait a few seconds between measurements.
 delay(2000);
 digitalWrite(PIN_LED, HIGH);
 ReadDHT();
 ReadLightLevel();
 if (debugCode) {
 PrintDebug();
 }
 digitalWrite(PIN_LED, LOW);
}

void ReadDHT() {
 humidity = 0;
 temperatureCelsius = 0;
 temperatureFahrenheit = 0;
 heatIndexCelsius = 0;
 heatIndexFahrenheit = 0;

 // Reading temperature or humidity takes about 250 milliseconds!
 // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
 humidity = dht.readHumidity();
 // Read temperature as Celsius (the default)
 temperatureCelsius = dht.readTemperature();
 // Read temperature as Fahrenheit (isFahrenheit = true)
 temperatureFahrenheit = dht.readTemperature(true);

 // Check if any reads failed and exit early (to try again).
 if (isnan(humidity) || isnan(temperatureCelsius) || isnan(temperatureFahrenheit)) {
 Serial.println("Failed to read from DHT sensor!");
 return;
 }

 // Compute heat index in Fahrenheit (the default)
 heatIndexFahrenheit = dht.computeHeatIndex(temperatureFahrenheit, humidity);
 // Compute heat index in Celsius (isFahreheit = false)
 heatIndexCelsius = dht.computeHeatIndex(temperatureCelsius, humidity, false);
}

void ReadLightLevel() {
 photocellReading = analogRead(PIN_PHOTORESISTOR);
 lightLevelPercent = ((float)photocellReading / 1023.0) * 100.0;
}

void PrintDebug() {
 Serial.print("Humidity: ");
 Serial.print(humidity);
 Serial.print(" %\t");
 Serial.print("Temperature: ");
 Serial.print(temperatureCelsius);
 Serial.print(" *C ");
 Serial.print(temperatureFahrenheit);
 Serial.print(" *F\t");
 Serial.print("Heat index: ");
 Serial.print(heatIndexCelsius);
 Serial.print(" *C ");
 Serial.print(heatIndexFahrenheit);
 Serial.print(" *F\t");
 Serial.print("Light Level: ");
 Serial.print(photocellReading); // the raw analog reading
 Serial.print("\t");
 Serial.print(lightLevelPercent); // the raw analog reading
 Serial.println(" %");
}

Output

DHTxx test!
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 198	19.35 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 183	17.89 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 182	17.79 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 182	17.79 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 193	18.87 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 194	18.96 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 188	18.38 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 181	17.69 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 178	17.40 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 183	17.89 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 198	19.35 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 189	18.48 %
Humidity: 34.00 %	Temperature: 21.00 *C 69.80 *F	Heat index: 20.04 *C 68.08 *F	Light Level: 187	18.28 %

 

 

Next Step -> Add Raspberry Pi and I2C Communication