2 layers55 × 106 mm
2 layers103 × 61 mm
SDC Schematic
Ozonised/SDCATmega 8 based self driving car.
- Size
- 103 × 61 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 36
- Pads
- 118
- Tracks, vias
- 177, 113
- Pours
- 12
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 19 Jul 2023
- Updated
- 22 Jan 2024
Overview
SDC Schematic is an open-source printed circuit board by Ozonised, from the Ozonised/SDC repository on GitHub. It is a 2-layer board of 103 × 61 mm with 32 parts on 36 nets, routed with 177 tracks and 113 vias.
It is built around the ATMEGA8A-PU and L293D. Its parts include 9 connectors, 7 capacitors, 6 resistors, 3 ICs and 1 switch. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA8A-PU
DIP-28-300mil-40℃~+85℃ 10bit 16MHz 1KB 2.7V~5.5V 23 512Byte 8 Bit 8KB AVR Built-in FLASH DIP-28-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
L293D
DIP-16-40℃~+150℃ 1.2A 2 4.5V~36V 4mA 600mA DIP-16 Brushed DC Motor Drivers ROHSSTMicroelectronicsStepper Motor Driver
README
README.mdSDC
ATmega 8 based self driving car.
Watch the YouTube video to develop some comprehension.
SETTING UP ATMEGA 8
The ATmega 8 is programmed using an ICSP programmer. In my case, I used an Arduino UNO as an ICSP programmer. By default, the microcontroller uses the internal 8MHz internal PC oscillator, but we want to use an external 16 MHz oscillator. So we need to make certain changes to the fuse bits of the ATmega 8. Below are the steps to do so:
- Download and install AVRDude. AVRDude is the program used by Arduino IDE and PlatformIO to upload your code to an AVR microcontroller.
- Open up the Arduino IDE, select
ArduinoISPunder File/Examples/ and hit upload. - Wire up the Arduino and ATmega8 as shown in the schematic:
- By default, the low fuse of the ATmega8 is set to 0xE1. This must be set to 0xE4 to configure the microcontroller to run at 8MHz. Type
avrdude -c stk500v1 -P COM5 -p atmega8 -b 19200 -U lfuse:w:0xe4:m -U hfuse:w:0xd9:m. Alternatively, you can use an online AVR fuse bit calculator for your selected microcontroller.
Note:
The -P <port>argument specifies the connection port. In my case, the arduino is connected to COM5 and hence the argument -P COM5. For -p <partno> either -p m8 or -p atmega8 can be used. Refer this guide for more information.
- That is all. The ATmega8 is now ready to be programmed with PlatformIO using the arduino as an ISP programmer.
PART LIST:
You can find the component list here.
The case along with the motor is available here: https://quartzcomponents.com/products/2wd-smart-robot-car-chassis-kit
MOC7811 optical encoders: https://quartzcomponents.com/products/moc-7811-encoder-sensor
HCSR04(Ultrasonic sensor): https://quartzcomponents.com/products/hc-sr04-ultrasonic-sensor-module?_pos=1&_sid=1f37cc7e0&_ss=r
Ultrasonic sensor mount: https://quartzcomponents.com/products/ultrasonic-sensor-mounting-bracket-for-hc-sr04?_pos=3&_sid=1f37cc7e0&_ss=r
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_3.5mm | H1, H2, H3, H4 |
| 3 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C4, C5 |
| 3 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R4, R5 |
| 3 | 680 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R6 |
| 3 | Conn_01x04 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J4, J5, J8 |
| 2 | 22pF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C2 |
| 2 | Conn_01x06_Socket | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J6, J9 |
| 2 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_Altech_AK300-2_P5.00mm | J1, J2 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C6 |
| 1 | 16MHz | Crystal:Crystal_HC49-4H_Vertical | Y1 |
| 1 | 220uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C7 |
| 1 | ATmega8A-P | Package_DIP:DIP-28_W7.62mm | U1 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J7 |
| 1 | Jack-DC | Connector_BarrelJack:BarrelJack_Horizontal | J10 |
| 1 | L293D | Package_DIP:DIP-16_W7.62mm | U2 |
| 1 | LM2596_module | lm2596_module:LM2596_module | U4 |
| 1 | SW_SPST | Button_Switch_THT:SW_PUSH_6mm_H4.3mm | SW1 |
The 31 most common of 32 parts.
Questions
How big is the SDC Schematic PCB?
It measures 103 × 61 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SDC Schematic use?
32 parts, built around the ATMEGA8A-PU and L293D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the SDC Schematic KiCad files?
From the Ozonised/SDC repository on GitHub, at the commit this page was made from: the board is SDC_Schematic/SDC_Schematic.kicad_pcb and its schematic SDC_Schematic/SDC_Schematic.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SDC Schematic design in my own project?
Its repository states no licence, so its author keeps all rights: ask Ozonised before reusing the design.
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