Materials
What components do I need to buy?
To assemble the PCB, it is necessary to buy some electro-mechanical components. To achieve a low cost of production of the robot, we decide to use parts available on sites like eBay and Aliexpress. But feel free to buy from other companies.
Below are some specifications, quantities, and where each component will be placed. Note that there is an optional built-in module for battery charging using IC TP4056, so if you want to build the board entirely, buy these components as well. Otherwise, you can just buy a TP4056 module and use the battery's auxiliary pin to recharge the robot.
Link to download: assembly_materials.pdf
| Sub-Assembly | Part Name | Device | Image | Package | Quantity | Description | Datasheet | Supplier | Cost* (USD) | Assembly Total |
|---|---|---|---|---|---|---|---|---|---|---|
| PCB | R0, R1, R2, R3, R4, R5, R6, R7 | Resistor 472 |  |
SMD R0805 | 8 | SMD Resistor 4K7 Ohm | link | link | ||
| R8 | Resistor 472 | |
SMD R0805 | 1 | SMD Resistor 4K7 Ohm | link | link | |||
| R9 | Resistor 000 | |
SMD R0805 | 1 | SMD Resistor 0 Ohm | link | link | |||
| R10 | Resistor 180 | |
SMD R0805 | 1 | SMD Resistor 18 Ohm | link | link | |||
| R11 | Resistor NM | |
SMD R0805 | 0 | Not Mounted | link | link | |||
| R15 | Resistor 000 | |
SMD R0805 | 1 | SMD Resistor 0 Ohm | link | link | |||
| C1, C2 | Capacitor 100 pF |  |
SMD C0603 | 2 | SMD Ceramic Capacitor 100 pF | link | link | |||
| LED0, LED1 | LED WS2812B |  |
SMD 5050 | 2 | SMD Intelligent Control LED | link | link | |||
| IRLML2502 | Mosfet IRLML2502 |  |
SOT23 | 1 | SMD N-Channel Mosfet | link | link | |||
| MUX | Mux CD4051 |  |
SOIC-16 | 1 | CD4051BM CMOS Single 8-Channel Analog Multiplexer/Demultiplexer | link | link | |||
| P0, P1, P2, P3, P4, P5, P6, P7 | IR TCRT5000L |  |
TCRT5000L | 8 | Reflective Optical Sensor with Transistor Output (long lead version) | link | link | |||
| SWITCH | Switch SS12F23 |  |
SS12F23 | 1 | SS12F23 Horizontal Slide Switch Handle Height 2 mm | link | link | |||
| BATT0, BATT1 | Connector JST-PH-2 |  |
JST-PH-2 | 2 | 2 pin JST PH 2.0mm Through Hole Header Vertical Straight Top Entry | link | link | |||
| I2C|UART | Female Socket Header 1X4 |  |
PH | 1 | 1×4 Pin Single Row Female 2.54mm Vertical Socket Header | link | link | |||
| E_LEFT, E_RIGHT, M_LEFT, M_RIGHT | Male Pin Header 1X3 |  |
PH | 4 | 1×3 Pin Single Row Male 2.54mm Breakable Pin Header | link | link | |||
| Bultin Battery Charger(Optional) | C3, C4 | Capacitor 10 uF | |
SMD C0603 | 1 | SMD Ceramic Capacitor 10 uF | link | link | ||
| R12 | Resistor 102 | |
SMD R0805 | 1 | SMD Resistor 1K Ohm | link | link | |||
| R13 | Resistor 101 | |
SMD R0805 | 1 | SMD Resistor 100 Ohm | link | link | |||
| R14 | Resistor 121 | |
SMD R0805 | 1 | SMD Resistor 120 Ohm | link | link | |||
| STDBY | LED SML 0805 Green |  |
SMD SML0805 | 1 | SMD LED Green (Standby) | link | link | |||
| CHRG | LED SML 0805 Red | |
SMD SML0805 | 1 | SMD LED Red (Charging) | link | link | |||
| TP4056 | TP4056 |  |
SOP-8 | 1 | 1A Standalone Linear Li-lon Battery Charger with Thermal Regulation | link | link | |||
| Integrated Systems | ESP-12E | ESP-12 NodeMCU CP2102 |  |
Socket | 1 | Slim Dev Kit based on microcontroller ESP8266 with WiFi SoC, integrates GPIO, PWM, I2C, 1-Wire and ADC all in one board. Version with CP2102 USB-TTL. | link | link | ||
| MT3608 | MT3608 Step-up Module |  |
Wire | 1 | MT3608 DC-DC Inverter Boost Converter Voltage Step Up Adjustable Power Step-up Supply Module 2A | link | link | |||
| IMU | MPU6050/GY-521 Module |  |
Socket | 1 | Module MPU6050 with 3 Axis Analog Gyro and 3 Axis Accelerometer Sensors and I2C communications protocol. | link | link | |||
| TP4056 | TP4056 Charging Module |  |
Wire | 1 | TP4056 Charging Module 5V Micro USB 1A Lithium Battery Charging Board with Protection Charger Module. | link | link | |||
| Battery | 3.7v 1800 mAh LIPO Battery |  |
103450 | 1 | LiPo Rechargeable Battery With 2-pin JST-PH Connector and Max Package for 103450 | link | link | |||
| Encoder | Rotary Encoder 48 PPR |  |
9MM | 2 | Kailh 9/10/11/12mm Rotary Mouse Scroll Wheel Encoder 1.74 mm Hole 40g Force | link | link | |||
| Chassis | Wheel | Rubber O-ring |  |
OD48CS5 | 2 | NBR Rubber O RING OD48 CS5mm | link | link | 0.20 | 1.20 |
| Bearing | Bearing 623zz |  |
3x10x4mm | 2 | Ball Bearing 623ZZ 3X10X4mm | link | link | 0.40 | ||
| Castor Wheels | Steels Balls |  |
4mm Diameter | 2 | Steels Balls 4mm Diameter | link | link | 0.05 | ||
| Wheel Fastening | M3x20mm Bolt with Nut and Pressure Washer |  |
M3 | 2 | M3x20mm Bolt with Nut and Pressure Washer | link | link | 0.20 | ||
| Chassis Fastening | M2.5x10mm Screws Self-Tapping |  |
M2.5 | 16 | M2.5x10mm Screws Self-Tapping | link | link | 0.25 | ||
| Pinion Gear Shaft | Standard Aluminium Rivets |  |
Mandrel Diameter 1.8mm | 2 | Required Only the Mandrel part of Rivet Diameter 1.8mm | link | link | 0.10 |