2 layers17 × 32.1 mm
Bidirectional level shifters
robertrico/hardware
Personal embedded systems portfolio — circuits, firmware, and physical builds. Each project showcases a hardware concept, toolchain, or interface.
6 parts1
2 layers58 × 104 mm
AT89S52
robertrico/hardware1Personal embedded systems portfolio — circuits, firmware, and physical builds. Each project showcases a hardware concept, toolchain, or interface.
- Size
- 58 × 104 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 42
- Pads
- 102
- Tracks, vias
- 100, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 13 Apr 2025
- Updated
- 6 Nov 2026
Overview
AT89S52 is an open-source printed circuit board by robertrico, from the robertrico/hardware repository on GitHub. It is a 2-layer board of 58 × 104 mm with 21 parts on 42 nets, routed with 100 tracks and 0 vias.
Its parts include 9 connectors, 4 capacitors, 1 resistor, 1 IC and 1 switch. It belongs with the 8051 (CH55x, STC, AT89) boards of this library.
README
README.mdEmbedded Systems Portfolio
Welcome to my Embedded Systems Portfolio. This document introduces several projects, highlighting their objectives, technologies, and current status.
LED Blinky Projects
Zephyr RTOS Blinky on Raspberry Pi Pico
- Objective: GPIO control demonstration using Zephyr RTOS.
- Technologies: Raspberry Pi Pico, Zephyr RTOS, DeviceTree.
- Current Status: Complete.
FreeRTOS LED Blinky for Pico W, Pico W2, ESP32
- Objective: Basic FreeRTOS demonstration with task scheduling and GPIO control.
- Technologies: FreeRTOS, Raspberry Pi Pico W, Pico W2, ESP32.
- Current Status: Complete
PicoBook
- Objective: A compact device fetching and displaying book data via Wi-Fi.
- Technologies: Raspberry Pi Pico W, MicroPython, OLED display, Wi-Fi.
- Current Status: Complete.
Zephyr OS "Hello World" on Raspberry Pi Pico
- Objective: Minimal Zephyr OS application printing to USB serial.
- Technologies: Zephyr OS, RP2040.
- Current Status: Complete
PicoW Over-The-Air (OTA) Firmware System
- Objective: Dual-partition bootloader enabling OTA firmware updates.
- Technologies: RP2040, pico-sdk, assembly, linker scripts.
- Current Status: Complete - But inoperable. There were struggles with the bootloader and ROM and highlighted knowledge gaps. This work was the catalyst for a full re-understanding of low level work. Inspiring the DINO project.
ESP-NOW Remote Control Project
- Objective: Wireless remote control for toggling LEDs using ESP-NOW protocol.
- Technologies: ESP32-C3, ESP-IDF, ESP-NOW.
- Current Status: Complete
The Earth Rover
- Objective: Modular rover system using ESP-NOW and STM32 for real-time motor control and wireless ADC data transmission.
- Technologies: ESP32-C3, STM32L432KC, ESP-NOW, FreeRTOS, STM32CubeMX, CMake, SPI, DMA, TB6612FNG, CD4053BE.
- Current Status: Communication functional; currently refining SPI packetization and synchronization.
Dino (Discrete Integrated Numeric Operator) CPU
Dino v0.01 – Manual Logic Sequencer
- Objective: CPU-free logic sequencer manually steps through memory and outputs 8-bit values via LEDs.
- Technologies: SN74LS590N counters, 555 timer, SRAM, DIP switches, LEDs.
- Current Status: In Progress. Schematic Phase.
Dino v0.1 – 8-bit CPU Core
- Objective: Upgrade to a functional 8-bit CPU with ALU, registers, and basic arithmetic operations.
- Technologies: 74F382N ALU, SN74LS273N registers, DM74LS374 latch.
- Current Status: Planned
Dino v0.1.1 – Instruction Decoder & 7-Segment Display
- Objective: Adds instruction decoding and output display.
- Technologies: SN74LS138N decoder, 7-segment display drivers.
- Current Status: Planned
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 22pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2 |
| 1 | 0.1µF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C4 |
| 1 | 10kΩ | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1 |
| 1 | 10µF | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C3 |
| 1 | 11.05920 MHz | Crystal:Crystal_HC49-U_Horizontal | Y1 |
| 1 | ALE | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J5 |
| 1 | AT89S52 | Socket:DIP_Socket-40_W11.9mm_W12.7mm_W15.24mm_W17.78mm_W18.5mm_3M_240-1280-00-0602J | U1 |
| 1 | GND | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J8 |
| 1 | P0 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J2 |
| 1 | P1 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J1 |
| 1 | P2 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J3 |
| 1 | P3 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | Reset | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | USB_B_Micro | Connector_USB:USB_A_Connfly_DS1095 | J7 |
| 1 | VCC | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J9 |
| 1 | ~{PSEN} | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J6 |
The 17 most common of 21 parts.
Questions
How big is the AT89S52 PCB?
It measures 58 × 104 mm and has 2 copper layers, 1.6 mm thick.
What parts does the AT89S52 use?
21 parts. 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 AT89S52 KiCad files?
From the robertrico/hardware repository on GitHub, at the commit this page was made from: the board is vintage/AT89S52/schematic/schematic.kicad_pcb and its schematic earth_rover/receiver/design/schematics/receiver_schematic.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the AT89S52 design in my own project?
Its repository states no licence, so its author keeps all rights: ask robertrico before reusing the design.
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