Shields are boards that can be connected on top of a control board to extend its capabilities. The Education shield is designed for CTC and has a collection of features that make it easy to use. Check out the illustration below to familiarize with the
education shield's capabilities.
- Reset button. When pressed the program uploaded to the control board is restarted.
- Breadboard. Read more about the breadboard here.
- Digital input and output pins. Directly connected to the digital pins on the board. You use these pins when you are using digital sensors or actuators. Some of these pins are PWM pins. They are directly connected to the PWM pins on the board. Use these
when you want to make analog outputs.
- A1 3-pin header port. Connected to analog pin A1. If you are using a sensor on this port you cannot use the analog pin A1 for something else.
- I2C connector. Some sensors and actuators use I2C communication. You can use this connector if you want to use these sensors/actuators.
- D6 and D9. These are digital 3-pin header ports. They are connected to digital pin 6 and 9 so if you’ve connected anything D6 or D9 you cannot connect another thing to digital pin 6 or 9.
- Speaker plug. You can use a speaker plug to plug in here. This is connected to digital pin 11 so do not use this pin for other things while a speaker is plugged in here.
- Ground and power pins. The voltage supply pin used in CTC is the IOREF pin. This pin outputs different voltages depending on the board(3.3V on a 101 board, 5V on an UNO board)
- Analog input pins. These pins are connected to the analog pins on the board. You use these with your analog sensors.
- SD card port is used for plugging a microSD card. Push in the card until it makes a “Click” sound and stucks. If you want to get it out, push the card first so it makes a “Click” sound and gets loose, then you can pull it out. The micro SD card reader
is connected to digital pins 10 to 13.
Keep in mind:
- Avoid using analog A4 and A5. Because of components on the shield connected to these pins (there are pull-up resistors to enable connecting to some sensors), they can behave a bit weird at times.
- Do not use digital pins 4 ,10, 11, 12 and 13 when using the micro SD card reader.
- Digital pins 9 to 13 cannot be used for capacitive sensors
- Digital pin 6, 9; analog pin A1 are connected to Component module ports, so if you’re using the Component module ports, don’t use the corresponding pins.
- Digital pin 11 is connected to the audio socket, when using a speaker don’t use the corresponding digital pin.
Modules with simple connectors
The simple connector ports are used for all the 3-pin connector modules, as well as other 3-pin components(servos in our case). Push button modules, light sensor modules, and power LED modules are some examples of CTC components that make connecting and prototyping easier through their simplified design.
If you’re trying to connect servos or other 3-pin modules, be sure about the direction of the connector so that GND is connected to GND, power to power and signal to signal. The color of a simple connector wire helps you remember it: red means power, orange or white means signal, and black means GND. Technically you can connect modules with simple connectors without 3-pin ports, as long as you plug the wires to the right pins.