The MIKROE boards shown in Figure 1 are used for troubleshooting your mikroBUS-based microcontroller projects. Think of them as test equipment accessories.
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Tester Click (right) contains LEDs for each signal as well as the 3.3 and 5 VDC supply lines.
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Terminal Click (left) exposes the mikroBUS pins to horizontal pins. These are accessible when a second Click board (not shown) is plugged into the Terminal Click itself. Look closely nas we can see the pin names such as AN, RST, CS, and SCK.
Follow this link for more information about MIKROE click and snap boards.
When to use the Tester Click
Use the Tester Click when starting a new project or a new microcontroller. The onboard LEDs allow you to visualize activity on each I/O pin. This is most useful for your verification of the board layout and microcontroller pin configuration.
When to use the Terminal Click
The Terminal Click is used when the microcontroller hardware has been properly configured. When combined with a logic analyzer such as the Digilent Analog Discovery 3, it allows the SPI, I2C, and RX/TX protocols to be observed. The serial messages can even be decoded so there is no need to guess at the bit sequence such as the worst-case 0xAA and 0x55 patterns.
Refer to this article for MIKROE project development.
Article by Aaron Dahlen, LCDR USCG (Ret.), Application Engineer at DigiKey. Author bio.