The Challenger RP2040 WiFi is a small embedded computer equipped with a WiFi module, in the popular Adafruit Feather form factor. It is based on an RP2040 microcontroller chip from the Raspberry Pi Foundation which is a dual-core Cortex-M0 that can run on a clock up to 133 MHz.
The RP2040 is paired with a 8 MB high-speed flash capable of supplying data up to the max speed. The flash memory can be used both to store instructions for the microcontroller as well as data in a file system and having a file system available makes it easy to store data in a structured and easy to program approach.
The device can be powered from a Lithium Polymer battery connected through a standard 2.0 mm connector on the side of the board. An internal battery charging circuit allows you to charge your battery safely and quickly. The device is shipped with a programming resistor that sets the charging current to 250 mA. This resistor can be exchanged by the user to either increase or decrease the charging current, depending on the battery that is being used.
The WiFi section on this board is based on the Espressif ESP8285 chip which basically is a ESP8266 with 1 MB flash memory integrated onto the chip making it a complete WiFi only requiring very few external components.
The ESP8285 is connected to the microcontroller using a UART channel and the operation is controlled using a set of standardized AT-commands.
|Microcontroller ||RP2040 from Raspberry Pi (133 MHz dual-core Cortex-M0) |
|SPI ||One SPI channel configured |
|I²C ||One I²C channel configured |
|UART ||One UART channel configured (second UART is for the WiFi chip) |
|Analog inputs ||4 analog input channels |
|WLAN controller ||ESP8285 from Espressif (160 MHz single-core Tensilica L106) |
|Flash memory ||8 MByte, 133 MHz |
|SRAM memory ||264 KByte (divided into 6 banks) |
|USB 2.0 controller ||Up to 12 MBit/s full speed (integrated USB 1.1 PHY) |
|JST Battery connector ||2.0 mm pitch |
|Onboard LiPo charger ||250 mA standard charge current |
|Onboard NeoPixel LED ||RGB LED |
|Dimensions ||51 x 23 x 3,2 mm |
|Weight ||9 g |