Embedded programming

During this week we visited the iFORNITURE fab lab in the city of Lima, we met with Evelin Cuadrado and Cristian to advance the group work, both in computer programming and also to learn about microcontrollers. In this regard, Evelin showed me in person the XIAO RP 2040 microcontroller, in which we identified its characteristics, design and programming. It was a challenge, but we are moving forward. We also discuss the electronics and programming of our projects to be developed.

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On the other hand, this small board has good processing performance, but requires less power. Overall, it is designed in a tiny size, as small as a thumb (21 x 17.8 mm) and can be used for portable devices and small projects. There are 14 GPIO PINs in Seeed Studio

• Powerful MCU: Dual-core ARM Cortex M0+ processor, flexible clock running up to 133MHz.
• Rich on-chip resources: 264 KB of SRAM and 2 MB of built-in Flash memory
• Flexible Compatibility: Compatible with Micropython/Arduino/CircuitPython
• Multiple interfaces: 11 digital pins, 4 analog pins, 11 PWM pins, 1 I2C interface, 1 UART interface, 1 SPI interface, 1 SWD bonding pad interface

Sometimes the Seeed Studio XIAO RP2040 port may disappear when the user programming process fails. We can solve this problem by following operation:

Connect the Seeed Studio XIAO PR2040 to your computer.Hold down the "B" button

A disk controller will appear on your computer:

At this point, the chip enters Bootloader mode and the recording port appears again. Because the RP2040 chip has two partitions, one is the Bootloader and the other is the user program. The product will record a bootloader code into the system memory when it leaves the factory. We can change the mode by carrying out the previous steps:

• It can operate in station mode, SoftAP mode, with a combination of both, or in promiscuous mode for multiple Wi-Fi applications. In addition, it supports Bluetooth 5 and Bluetooth mesh functionalities.
• The XIAO ESP32C3 MCU board mounts the ESP32-C3 chip, which operates at a clock frequency of 160 MHz. It has multiple development ports and Arduino/CircuitPython support
• It has four work modes, with energy consumption as low as 44 μA in deep sleep mode. For its power, it supports charging from a lithium battery, and its design allows it to be mounted on a breadboard, in addition to supporting SMD design, since it does not have components on the back
• The chip also includes 400 KB of SRAM and 4 MB of flash memory, providing more programming space and more possibilities in IoT control scenarios

*A3(GP105) - Uses ADC2, which may become inoperative due to false sampling signals. For reliable analog reads, use ADC1(A0/A1/A2) instead. Refer to the ESP32-C3 datasheet.

5V - This is 5v out from the USB port. You can also use this as a voltage input but you must have some sort of diode (schottky, signal, power) between your external power source and this pin with anode to battery, cathode to 5V pin.

3V3 - This is the regulated output from the onboard regulator. You can draw 700mA

GND - Power/data/signal ground

Seeed Studio presents the small XIAO ESP32C3 board, a microcontroller that has wireless connection capabilities via Wi-Fi and Bluetooth Low Energy (BLE). It is part of the XIAO series from Seeed Studio itself, consisting of small development boards that share a similar hardware structure and small size. Based on the 32-bit RISC-V architecture, we can use it in all types of IoT scenarios, and if we want to increase its wireless connectivity capacity, we can use an antenna that operates in the 2.4 GHz band, which has TELEC certification. With this U-FL antenna, its communication radius reaches 100 meters, which is not bad for a device that measures 21x17.5 mm.