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Animatronic Grogu 2.0
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Electronics
Grogu's electronic heart is an ESP32 WROOM 32 by diymore that takes over the control of the servos and sounds, as well as the wifi communication with smartphones and remote controls.
First attempts on the breadboard:
Above in the picture - Grogus ESP32:
Pinout of the ESP32
| ESP32 PIN | Component PIN | Component |
|---|---|---|
| G13 | RXD | MP3 Player |
| G14 | TXD | MP3 Player |
| GND | GND | MP3 Player |
| 3.3V | VCC | MP3 Player |
| G16 | RXD | STS Servos Bus |
| G17 | TXD | STS Servos Bus |
| GND | GND | STS Servos Bus |
| G18 | RXD | SCS Servos Bus |
| G19 | TXD | SCS Servos Bus |
| GND | GND | SCS Servos Bus |
| G21 | SLC | i²c Bus |
| G22 | SDA | i²c Bus |
| 3.3V | VCC | i²c Bus |
| GND | GND | i²c Bus |
| G25 | Pin 1 | Action button 1 |
| GND | Pin 1 over 1kΩ resistor | Action button 1 |
| 3.3V | Pin 2 | Action button 1 |
| G26 | Pin 1 | Action button 2 |
| GND | Pin 1 over 1kΩ resistor | Action button 2 |
| 3.3V | Pin 2 | Action button 2 |
| 5V | 5V out via Schottky diode | Voltage Source |
| GND | GND | Voltage Source |
I²C Bus
Devices connected to the i²c bus:
Grogus OLED display (right in the picture):
Filter switches/buttons with pull-down resistor
The filter switches are connected to pins G25 and G26 of the ESP32. The button is connected to a pull-down resistor of 1kΩ to pull the pin to GND when the button is not pressed.
Sound Module
The sound is produced by a YX5300 Serial MP3 Player Module connected to the ESP32 via a serial port. The module can read and play a micro SD card with MP3 files. The ESP32 controls the module via the serial port and can thus control the playback of sounds.
Grogus sound module (right in the picture):
For the speaker, I used a Waveshare 8Ω 5-Watt Speaker connected to the sound output of the YX5300 Serial MP3 Player via a PAM8403 amplifier .
Grogus Speakers and Amplifiers:
Grogus Speakers and Amplifiers:
Power supply
The Grogu is powered in stationary mode with a power supply and mobile via a LiPo battery with XT60 plug with 7.4V 80C 5200mAh. The battery is connected to a 5A fuse and an on/off switch. The voltage is reduced to 5V via a step-down converter to power the electronics. In addition, the voltage for the servos is reduced to 6V via a second, more powerful XL4016E1 Step Down Voltage Converter . The voltages are displayed on Grogu's back via small 7-segment displays to check whether the voltages are stable at any time.
Stottky Diodes
The two Schottky diodes on the ESP32 are used to isolate the voltages of the 5-volt step-down converter and the USB cable to prevent the voltages from interfering with each other. Unfortunately, one diode has to be soldered into the USB cable, otherwise you won't get in the way:
