The Hardware used in the Course
The CPU card features an Espressif ESP32-wroom-32 with
- 2 low-powerXtensa®32-bitLX6microprocessors
- 520 KB of on-chip SRAM for data and instructions
- 4 MB of SPI flash
- I2C, I2S, SPI interfaces
- 3 UARTs, 12 bit ADC up to 18 channels, 8 bit DAC
Here is a photo of the board:
For more details please read the data sheet: http://localhost/pub/UCC_Course_2020/TheHardware/esp32-wroom-32_datasheet_en.pdf
This board has no active elements but it connects sensor shields to the CPU board. Like this the necessary connections are made in a Lego based manner by just plugging modules together without any further cable connections or soldering.
Two different types of switches are available as shields: a mechanical push button switch and a PIR sensor.
| Mechanical Switch | PIR Sensor |
|---|---|
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On the CPU card there is a user programmable LED which is used in the exercise on LEDs. This is a simple, single color (blue) LED. In the series of shields we can also find an LED chain with 7 addressable WS2812 RGB LEDs.
There are several different environmental sensors of which we will use the DHT11 and the SHT30 temperature and humidity sensors. We work with both sensors in different exercises because these shields use quite different communication protocols which we want to study.
In addition to the temperature and humidity sensors we have a barometric pressure sensor, (which also allows to measure ambient temperature) the BMP180. With these 3 sensors we can construct a simple weather station.
DHT11 Temperature and Humidity Sensor | SHT30 I2C Temperature and Humidity sensor | BMP180 Barometric Pressure Sensor
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