HACKADAY SUPERCONFERENCE BADGE, Руководство пользователя

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2. HARDWARE
The display consists of a red 8×16 LED matrix. There is also an infrared transceiver and five
tactile buttons, plus a RESET key. MCU is Microchip's 8-bit PIC18LF25K50 in 28-pin case, and the
power is supplied by two AAA batteries. There is one USB Micro-B connector and two groups of
pads, ready for connectors. One of them is 5-pole ICSP (In-Circuit Serial Programmer), and the
other one is 9-pole I/O connector.
PCB dimensions are 46×139 mm. 8×16 LED matrix is built of 128 discrete SMD LEDs and
refreshed by SCT2024CSSG constant current driver, permanently assisted by MCU. CPU clock is
48 MHz (which is 12 MIPS), so display refresh takes about 1% of processor time. Infrared
transmitter is a single 940 nm LED, and the receiver is TSOP6240TTCD, which contains a photo
detector, an AGC preamplifier, and a 40KHz band-pass filter and demodulator.
Here is the complete schematic diagram of the badge: