ExpanderPi
€38,95 /€32,19 excl. VAT
9 in stock
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Description Expander Pi
The Expander Pi is a versatile digital and analog expansion board. It allows you to put things like switches, lights, sensors and devices on your Raspberry Pi to connect† The Expander Pi connects to the GPIO pins of the Raspberry Pi† With the optional mounting kit you can securely mount the Expander Pi. The Expander Pi is powered through the Raspberry Pi using the GPIO pins or via the built-in power connector† The extended GPIO pins allow you to stack the Expander Pi with other expansion cards.
The Expander Pi allows you to connect 8 analog inputs, 2 analog outputs, and 16 digital I/Os to the Raspberry Pi connect. It board also comes with a built-in Real Time Clock (RTC). This gives you Raspberry Pi always the right time.
The 16 I/O channels use the MCP23017 16-bit I/O expander from Microchip Technology Inc. They can be configured independently as input or output. The maximum input is 5V per channel.
The 2-channel digital to analog converter has a 12-bit resolution. It uses the MCP4822 dual-channel 12-bit DAC with internal voltage reference.
The 8 analog to digital converter has a 12-bit resolution. It uses a Microchip MCP3208 8-channel 12-bit A/D converter with SPI serial interface† The maximum sample rate is 100 ksps and includes a 4.096 volt precision voltage reference. Note that the maximum sample rate depends on:
The programming language used, the CPU speed and usage.
A separate Vref pin is included. This allows you to use an external voltage reference. If you choose to use an external voltage reference, you must disconnect the built-in voltage reference IC† You do this by removing the solder bridge from jumper J1. If you do not remove the J1 solder bridge when using an external reference, it may board to damage.
The RTC uses the DS1307 RTC real-time clock and a CR2032 battery to keep track of the date and time. This occurs when the main system power is not available.
Please note, do not connect the Expander Pi to the Raspberry Pi when power is connected without a CR2032 battery installed† This may cause damage to the DS1307 RTC chip.
The Expander Pi uses a CR2032 button battery (battery not included).
Due to the use of the SPI bus and fixed addresses on the I2C bus, the Expander Pi cannot be stacked with the ADCDAC Pi Zero or RTC Pi Plus† Only one Expander Pi can be used on one Raspberry Pi.
The I2C address for the MCP23017 digital I/O chip is set to 0x20. If you want to use the Expander Pi with an IO Pi Plus/Zero you have to make sure that the addresses on the IO Pi chips are not set to 0x20.
It is possible to Raspberry Pi and power the Expander Pi separately. It is then wise to remove the solder bridge "JUMPER" next to the GPIO pin 1 of the Expander Pi. This will disconnect it from the Raspberry Pi 5V pin.
Features Expander Pi
- 16 channel digital inputs / outputs
- 8 channel 12 bit resolution analog input (ADC)
- 2-channel 12 bit resolution digital to analog output (DAC)
- Real-time clock (RTC) with CR2032 battery holder.
- Mounting holes for use with the AB Electronics UK mounting kit (available separately)
- Soldering is required
- Suitable for eg Raspberry Pi 3, 4 and Zero boards
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