(r3) TheHardware < IoT_Course

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---+ The Hardware
---++ The CPU card

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 interface
   * 3 !UARTs, 12 bit ADC up to 18 channels, 8 bit DAC
Here is a photo of the board:

<img alt="esp32.png" height="313" src="%ATTACHURL%/esp32.png" title="esp32.png" width="410" />

For more details please read the data sheet:

%ATTACHURL%/esp32-wroom-32_datasheet_en.pdf
---++ The Base Board

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.

<img alt="tripleBase.png" height="241" src="%ATTACHURL%/tripleBase.png" title="tripleBase.png" width="471" />
---++ Switches

Two different types of switches are available as shields: a mechanical push button switch and a PIR sensor.
| mechanical switch | PIR sensor |
| <img alt="button.png" height="455" src="%ATTACHURL%/button.png" title="button.png" width="432" /> | <img alt="pir.png" height="457" src="%ATTACHURL%/pir.png" title="pir.png" width="429" /> |

---++ LEDs

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. <br />In the series of shields we can also find an LED chain with 7 addressable WS2812 RGB LEDs.

<img alt="leds.png" height="440" src="%ATTACHURL%/leds.png" title="leds.png" width="444" />
---++ Temperature and Humidity Sensors and Barometric Pressure Sensor

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 |
| <img alt="wemosDHT11.png" height="293" src="%ATTACHURL%/wemosDHT11.png" title="wemosDHT11.png" width="363" /> | <img alt="sht30.png" height="333" src="%ATTACHURL%/sht30.png" title="sht30.png" width="429" /> | <img alt="bmp180.png" height="279" src="%ATTACHURL%/bmp180.png" title="bmp180.png" width="280" /> |

---++ Real Time Clock and Data Logging

In order to store data taken with the environmental sensors we us a micro SD card supplied with the Real Time Clock and Data Logger card. With the Real Time Clock we cat get a time stamp telling is when the data have been taken.

<img alt="rtc.png" height="347" src="%ATTACHURL%/rtc.png" title="rtc.png" width="413" />
---++ Displays

Of course we can transfer the measurement data to a PC over the Internet and use the plotting facilities on the PC to graphically show the data but it may sometimes be interesting to show the data also on the micro-controller without the need of an Internet access. This can be done with TFT screen sensors. The one we will use has a resolution of 128*128 pixels and text as well as simple pixel based graphics is possible with these devices.

<img alt="tftScreen.png" height="422" src="%ATTACHURL%/tftScreen.png" title="tftScreen.png" width="328" />
---++ Motors

You can also control differnt types of motors with the ESP32. To demonstrate this we use the motor controller shield.

<img alt="motorController.png" height="440" src="%ATTACHURL%/motorController.png" title="motorController.png" width="433" />

with 3 different types of motors:

| DC motor | servo motor | stepping motor |
| <img alt="dcMotor.png" height="271" src="%ATTACHURL%/dcMotor.png" title="dcMotor.png" width="328" /> | <img alt="servo.png" height="358" src="%ATTACHURL%/servo.png" title="servo.png" width="423" /> | <img alt="stepper.png" height="305" src="%ATTACHURL%/stepper.png" title="stepper.png" width="443" /> |
-- %USERSIG{TWikiAdminUser - 2020-04-25}%

---++ Comments

%COMMENT%

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who
png	bmp180.png	r2 r1	manage	132.7 K	2020-05-14 - 18:10	UliRaich
png	button.png	r1	manage	279.6 K	2020-05-14 - 17:57	UliRaich
png	dcMotor.png	r1	manage	52.1 K	2020-05-14 - 18:13	UliRaich
pdf	esp32-wroom-32_datasheet_en.pdf	r1	manage	512.3 K	2020-05-14 - 17:35	UliRaich
png	esp32.png	r1	manage	225.8 K	2020-05-14 - 17:37	UliRaich
png	leds.png	r1	manage	292.6 K	2020-05-14 - 18:00	UliRaich
png	motorController.png	r1	manage	303.5 K	2020-05-14 - 18:13	UliRaich
png	pir.png	r1	manage	319.4 K	2020-05-14 - 17:57	UliRaich
png	rtc.png	r1	manage	172.2 K	2020-05-14 - 18:24	UliRaich
png	servo.png	r1	manage	143.0 K	2020-05-14 - 18:13	UliRaich
png	sht30.png	r1	manage	123.1 K	2020-05-14 - 18:06	UliRaich
png	stepper.png	r1	manage	134.6 K	2020-05-14 - 18:13	UliRaich
png	tftScreen.png	r1	manage	144.4 K	2020-05-14 - 18:31	UliRaich
png	tripleBase.png	r1	manage	196.1 K	2020-05-14 - 17:41	UliRaich
png	trippleBase.png	r1	manage	153.3 K	2020-05-14 - 17:38	UliRaich
png	wemosDHT11.png	r1	manage	113.4 K	2020-05-14 - 18:07	UliRaich

Topic revision: r3 - 2020-05-14 - UliRaich