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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe Adafruit CH552 QT Py puts an 8-bit 8051-family microcontroller into a compact, modern board with USB-C, native USB, STEMMA QT, and an onboard RGB NeoPixel. It is not a typical QT Py programming experience: it does not run CircuitPython or MicroPython and cannot use Arduino libraries. You can use the Arduino IDE with Adafruit’s ch55xduino board package, but the compiler targets C rather than C++.
What is the Adafruit CH552 QT Py?
It is a small development board built around the CH552, an enhanced E8051 core compatible with the MCS51 instruction set. Adafruit’s guide describes the combination as a compact way to experiment with an older 8-bit architecture using contemporary board features. “Vintage” describes the processor family—not the USB-C connector, board format, or the whole development workflow.
The board is Seeed XIAO-compatible in size, form factor, and pinout, and its castellated pads allow it to be mounted flat on a circuit board. Its USB-C port handles power and programming. Adafruit lists the board as product ID 5960; check the official listing for current price and availability, which can change.
What hardware does the board provide?
Adafruit’s product documentation specifies a 16 MHz operating speed, 3.3 V power and logic, 16 KB of program flash, 256 bytes of internal RAM, and 1 KB of xRAM. The small memory budget is an important part of the board’s character: it suits compact, focused experiments better than projects that depend on large runtimes or substantial application code.
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- CH552 is an enhanced E8051 core MCU compatible with MCS51 instruction set. 79% of its instructionsare single-byte single-cycle instructions, and the average instruction speed is 8 ~ 15 times faster than thatof the standard MCS51.
- CH552 supports the maximum 24MHz system dominant frequency, with built-in 16K program memoryROM and 256-byte internal iRAM and lK-byte internal xRAM. xRAM supports DMA direct memoryaccess.
- CH552 has built-in ADC analog-digital conversion, touch key capacitance detection, 3 sets of timers andsignal capture and PWM, double UARTs, SPI, USB device controller and full-speed transceiver and otherfunctional modules.
- Core: Enhanced E8051 core compatible with MCS51 command set, 79% of its commands are single-byte single-cycle commands, and the average command speed is 8 ~ 15 times faster than that of the standard MCS51, with special XRAM data fast copy command, and double DPTR pointer.
- ROM: Non-volatile memory ROM that can be programmed for many times, with the capacity of 16KB, can all be used for program storage. Or it can be divided into a 14KB program storage area and a 2KB BootL oader/ISP program area.
| Feature | Adafruit’s published specification |
|---|---|
| Processor | CH552 enhanced E8051 core, MCS51 instruction-set compatible |
| Clock | 16 MHz |
| Memory | 16 KB program flash; 256 bytes internal RAM and 1 KB xRAM |
| GPIO and analog input | 10 GPIO; four 8-bit analog input pins |
| Other I/O | Three PWM outputs; hardware UART and SPI; capacitive touch on A0–A3 |
| USB | Native full-speed USB device capability; can present as CDC serial or mouse/keyboard HID |
| Power and logic | 3.3 V |
| Regulator | 600 mA peak output, not a guaranteed current budget for every connected load |
| Onboard features | STEMMA QT I2C connector, RGB NeoPixel, reset and boot buttons |
These are board specifications, not a promise that every peripheral can be used simultaneously without considering pin assignments, power draw, and the needs of attached components. Consult Adafruit’s pinout guide when planning a circuit.
Can the CH552 QT Py run Arduino?
Yes, with an important qualification. Adafruit documents using the Arduino IDE with the ch55xduino board support package, but the toolchain compiles C rather than C++. The board does not support Arduino libraries, so sketches and examples that assume the familiar C++ Arduino ecosystem may not work without substantial adaptation.
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- Activity LED lights up when the SD card is being read or written
- Push-push socket with card slightly over the edge of the PCB so its easy to insert and remove
- Works great with Arduino, with tons of example code and wiring diagrams
- Skill Level: Component or Part
Adafruit’s setup guide calls for Arduino IDE version 1.8 or higher and installation of ch55xduino. Because setup instructions and software versions can change, follow the current Arduino IDE setup guide rather than relying on an old package-installation walkthrough.
Does it support CircuitPython or MicroPython?
No. Adafruit explicitly says the CH552 QT Py does not run CircuitPython or MicroPython. If you want to write Python on a QT Py, or expect the straightforward beginner workflow associated with CircuitPython, this board is the wrong fit.
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- Super simple to use
- Works with just about any brushed DC motor.
- You can set the current limiting with an removable external resistor Rlim
Its appeal is instead the chance to work with a constrained 8051-family MCU and a C-based environment while still having practical interfaces such as USB, analog inputs, PWM, SPI, UART, and I2C. Treat it as a low-level learning or embedded-I/O board, not as a drop-in replacement for more capable QT Py models.
What can you build with it?
Adafruit’s guide demonstrates several small projects that match the board’s available resources:
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- Project box with breadboard and jumper wires
- Resistors, Capacitors, LED
- Semiconductors (diodes, transistors, 7805, LD1117-3.3, 555 timer)
- Photocell, Thermistor, Vibration sensor, potentiometers
- Piezo buzzer, tactile switches, SPDT switches, male and female headers
- Read a potentiometer: use one of the analog inputs to observe changing voltage.
- Explore capacitive touch: use the touch capability on A0–A3.
- Control the onboard NeoPixel: experiment with a built-in RGB indicator without adding a separate LED.
- Read an I2C sensor: connect an AHT20 temperature and humidity sensor through STEMMA QT. Adafruit’s example uses a separate four-pin JST-SH cable; the sensor and cable are accessories, not included board contents. See the I2C guide.
The CH552 also has native USB device capability, including CDC serial and mouse or keyboard HID use cases. Those options make it useful for compact USB experiments, although the limited memory and nonstandard Arduino-library situation should shape the project design.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do you recover if uploading stops working?
USB-C is used for both power and programming. Adafruit documents a manual bootloader procedure for cases where the serial port disappears or HID firmware interferes with normal uploading:
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- � 3% relative humidity measurements with a range of 0�80% RH
- �0.4 �C temperature accuracy at a range of -10 to +85 �C
- Uses I2C for data transfer so it works with a wide range of microcontrollers
- PTFE filter to keep the sensor clean
- Unplug the board’s USB cable.
- Hold down the Boot button.
- Reconnect USB while continuing to hold Boot, then follow the upload process in Adafruit’s manual bootloader instructions.
If you only have Micro-B USB cables, Adafruit notes that an adapter will be useful.
Who should choose this board?
The strongest reason to choose the CH552 QT Py is the combination of its 8051-family architecture and compact modern hardware. It makes sense if you want to explore a small C-based microcontroller, build simple USB-device or sensor projects, or use a XIAO-sized board with STEMMA QT and an onboard NeoPixel.
Choose a different board if your priority is CircuitPython or MicroPython, broad Arduino-library compatibility, more memory, or a more beginner-friendly high-level workflow. Adafruit contrasts the CH552 with faster QT Py options such as an ESP32-S3, but its materials do not establish a comprehensive, like-for-like performance benchmark. Compare the architecture, supported languages and libraries, interfaces, pinout, and connector needs for your project rather than treating the CH552 as a general-purpose upgrade or replacement.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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