#babyplotclock
- Realize handwriting function
- Realize voice time reporting
- Realize handwritten Chinese time
- Realize manual time adjustment
- Realize the rechargeable function
gpio reference: https://wiki.radxa.com/Rockpi4/hardware/gpio Pin Mapping
PROCK Pi 4 has a 40-pin expansion header. Each pin is distinguished by color.
| Additional Function | Primary Function | PIN | PIN | Primary Function | Additional Function |
|---|---|---|---|---|---|
| +3.3V | 1 | 2 | +5.0V | ||
| I2C7_SDA | 3 | 4 | +5.0V | ||
| I2C7_SCL | 5 | 6 | GND | ||
| SPI2_CLK | 7 | 8 | UART2_TXD | ||
| GND | 9 | 10 | UART2_RXD | ||
| PWM0 | 11 | 12 | I2S1_SCLK | ||
| PWM1 | 13 | 14 | GND | ||
| SPDIF_TX | 15 | 16 | GPIO4_D2 | ||
| +3.3V | 17 | 18 | GPIO4_D4 | ||
| UART4_TXD | SPI1_TXD | 19 | 20 | GND | |
| UART4_RXD | SPI1_RXD | 21 | 22 | GPIO4_D5 | |
| SPI1_CLK | 23 | 24 | SPI1_CSn | ||
| GND | 25 | 26 | ADC_IN0 | ||
| I2C2_SDA | 27 | 28 | I2C2_CLK | ||
| I2C6_SCL | SPI2_TXD | 29 | 30 | GND | |
| I2C6_SDA | SPI2_RXD | 31 | 32 | SPDIF_TX | UART3_CTSn |
| SPI2_CSn | 33 | 34 | GND | ||
| I2S1_LRCK_TX | 35 | 36 | I2S1_LRCK_RX | ||
| GPIO4_D6 | 37 | 38 | I2S1_SDI | ||
| GND | 39 | 40 | I2S1_SDO |
Driver library reference: https://wiki.radxa.com/Rockpi4/dev/libmraa Driver library source code warehouse: https://github.com/eclipse/mraa Python3.7 cannot be installed with apt. . . So compile and install it with the source code, and it works.
Red vcc, brown gnd, yellow sig Pin definition: No. 1 servo (control up and down): sig->11 (gpio no.146) No. 2 servo (left): sig->11 (gpio no.146) No. 3 servo (right): sig->13 (gpio no.150) Relay: sig->15 (gpio no.149) Since the rockpi4 board only has 2 pwm ports, I used a relay to let the two servos share a sig interface, and one of the servos was disconnected from the power supply by controlling the relay. The steering gear is powered by a lithium battery boosted to 5v, and the steering gear should share the ground with the board, otherwise there will be no response.
Sox is used as the voice playback software.