Examples of bio sketch

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Examples of bio sketch

The Atmega is configured to use internal pull-up resistors which may be adequate for short cable runs. Also see further down in this thread for some screen-shots of the effect of using different pull-up resistors.

Examples of bio sketch

Of course, you also need to connect Examples of bio sketch GND ground pins to complete the circuit. The pins should be connected together that is, pin 4 to pin 4, and pin 5 to pin 5, if you are connecting Arduino Unos together.

This is because the pull-up resistors keep the lines high until one of the devices wants to use it by pulling a line low. In other words, you don't swap pins like you do with serial communications, where you connect Tx to Rx and vice-versa. Note also that the Atmega specifies a maximum bus capacitance of pf, so that would rule out long cable runs.

Sending data Let's start with an image - this is a screenshot taken with a logic analyser. It shows the character "S" 0x53 being sent from the Arduino to the device at address From the above graphic note the following points of interest: The transmission starts with the "Start condition" labelled Start.

The 7-bit address of the required slave is then transmitted, most significant bit first.

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In this case it was 42 0x2A or 0b The logic analyser reports the address as being 0x54 but that is really 0x2A this is, 42 shifted left one bit, so that the "write" bit 0 is in the least-significant bit place.

The master then waits for the slave to pull the SDA line low which is an ACK acknowledge that a slave of that address exists and is ready to receive data. If there is no slave connected and powered on, or it does not have the required address, then it will ignore the address, leaving the SDA line high by the pull-up resistor.

This counts as a NAK negative acknowledgement. This can be tested for in the software. Then the data byte 0x53 in this case is transmitted, most significant bit first. Again, after the 8 bits of data, the master checks that the slave acknowledges by pulling the SDA line low.

Examples of bio sketch

Thus, each byte is acknowledged. More data bytes could be transmitted, but are not shown here. The transmission is ended by the "Stop condition" labelled Stop which is sent by releasing the SDA line to allow it to be pulled up while SCL stays high. It is a good idea to check that you got zero, otherwise you are sending "blind".

If you do not get zero maybe you have the wrong slave address. Try running the "I2C scanner" described later in this thread. The code above uses address 42 for the slave, and also uses the LED on pin 13 which is standard on the Arduino Uno to confirm visually that the transmission took place.

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Feb 03,  · This post describes how the I2C (Inter-Integrated Circuit, or "Two-Wire") interface works, with particular reference to the Arduino Uno which is based on the ATmegaP microprocessor chip.

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Gammon Forum : Electronics : Microprocessors : I2C - Two-Wire Peripheral Interface - for Arduino