Qron0b
Qron0b is an open source AVR/Arduino PCB design by qewer33: a 2-layer, 35 × 35 mm board with 29 components (8 distinct parts). It is built around the ATtiny24A-SS, DS1302Z+, 74HC595. Filed under displays & leds.
a sleek and low-power binary wristwatch
qron0b is a minimalist and low-power digital binary wristwatch. It uses an Attiny24A/44A/84A as it's MCU, uses the DS1302 as it's RTC and displays the time in BCD (binary coded decimal) format with it's integrated 4x4 LED matrix driven by an 74HC595 shift register. It's powered by a single CR2032 coin cell battery. It's designed to use minimal power and can run without a battery change for months.
Built around
Parts list
29 components, 8 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATtiny24A-SS | SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | DS1302Z+ | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | 74HC595 | SOIC-16_3.9x9.9mm_P1.27mm | U3 |
| 1 | Crystal | Crystal_C38-LF_D3.0mm_L8.0mm_Horizontal | Y1 |
| 16 | LED | LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1, D2, D3, D4, D5, D6, D7, D8 +8 |
| 4 | 0.1uF | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C2, C3, C4 |
| 1 | 1.5K | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1 |
| 4 | 1K | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R2, R3, R4, R5 |
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