这是本文档旧的修订版！
Introduction
SuperMini NRF52840 is a Pro Micro alternative development board that is compatible with Nice! Nano. Its pins are the same as ProMicro, which means it can be used with almost any ProMicro keyboard. The NRF5280 development board has a 3.7V lithium battery interface and a software switch that can cut off the power of the LED. When turned off, the standby power consumption can reach 1mA.
nRF52840 is a high-performance, low-power wireless SoC chip launched by Norwegian Nordic Semiconductor. It supports multiple wireless protocols, including Bluetooth 5, Thread, Zigbee, ANT, and 2.4GHz. The nRF52840 chip uses an ARM Cortex-M4F processor, clocked at 64MHz, with built-in 1MB of flash memory and 256KB of RAM. It also has a variety of peripherals, including ADC, PWM, SPI, I2C, UART, USB and GPIO, etc. In addition, nRF52840 also supports a variety of security functions, such as AES encryption, SHA-256 hashing and True Random Number Generator (TRNG).
Hardware description
Product Parameters Powerful wireless capabilities: Bluetooth 5.0, onboard antennaPowerful CPU: nRF52840 chip uses ARM Cortex-M4F processor, clocked at 64MHz, built-in 1MB flash memory and 256KB RAMBattery charging chip: supports lithium battery charging and dischargingPower consumption: standby power consumption can reach 1mA
Pin Diagram
Dimensions
Power Supply
SuperMini NRF52840 supports charging and discharging of 3.7V lithium battery. The charging rate is 100mA during charging, so a 2000mAh battery takes 20 hours to be fully charged.
Recharging Current warnWhen BOOST is connected, the charging current increases from 100ma to 300ma, and it can only be connected when the capacitor capacity is greater than 500mAh (to avoid explosion💥).
External Battery
If you need an external battery, you only need to connect the + stage of the battery to B+ and the negative stage to B-. The external lithium battery only supports 3.7V and the charging rate is 100mA (a 2000mAh battery takes 20 hours to be fully charged).NoticeWhen welding, please be careful not to short-circuit the positive and negative poles, which may burn the battery and equipment.
External VCC control
hintWhen P0.13 is set to low, the power supply to the 3.3V, VCC pin will be turned off. This is useful for reducing components that use power when idle (e.g. RGB, LEDs).
Bootloader
If you want to enter Bootloder, please short RST to GND twice within 0.5S. Enter Bootloder, connect to the computer via USB, and a storage device called Nice! Nano will be displayed. At this point you can drag in the .uf2 file to burn the program.
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评论
能否在你们的 wiki 上提供 PCB 基底面？
我知道大部分基底面都与 nice!nano 或 ProMicro 相同，但不包括 3 个额外的引脚 p1.01、p1.02、p1.02。我需要尺寸和距离，以便在 PCB 上为这些 GPIO 引脚开孔。
用 Deepl 翻译
已经更新了
PCB 印迹“
I have converted the PCB files to a KiCAD footprint here: https://github.com/BlueDrink9/supermini-nrf52840-kicad
Would it be possible to provide a 3D model of this PCB? I believe it would greatly benefit the product development process, particularly in designing the product's case, or designing a keyboard based on this board, and conducting integration testing. Additionally, exporting a 3D model from Altium is a straightforward process.
Anyone tried with arduino sketch ? I failed couple of NREF52840 board, it won't boot again anymore.
once i connected USB-C, it appears COM port correctly and burn to programs. it is look death. just blink blue led only.
BOARD : Adafruit feather nRF52840 Express SoftDevice : S140.6.1.1 Port : “COM7” Programmer : “Bootloader DFU for bluefruit nRF52” Code : Default empty code
You have to short RST pint to GND twice and it should switch to programming mode
hello, i would like ask you aboutr the I2C pins for this board, i culdnt identify them thank you so much
Where is the board opensourced at?
Hello, I have created a reference model for this development board. It can be found here: https://www.printables.com/model/990134-supermini-pro-micro-nrf52840-reference-model
I hope it helps you in your development endeavors.
I will need to use the NFC feature of NRF52840. So, how will I plug the NFC antenna on this board? Please confirm to me that I will need to solder an NFC antenna to pins P0.09 and P0.10
Is there any way to disable leds or lower current consumption on startup? Right now when I wake from deep sleep it pulls 7mA for half a second
Did you solve this? I have the same question?
The schematic is published at https://chat.nologo.tech/d/80 I reuploaded it to https://imgur.com/gallery/nrf52840-supermini-promicro-schematic-q1T3BJY
Has anyone been able to read the battery voltage? It looks like it should be possible on P0.04 based on the schematics. Using Zephyr I was able to read a voltage from a different source on a different AIN pin. Appreciate help.
According to the schematic, the voltage divider for the battery voltage is NC so the resistors are not installed. I'm not 100% but I think these are the two empty 0201 footprints between the two SOT23 ICs
Ok so after doing some measaurements it seems that the schematic is wrong. Even after installing the two 0201 resistors, you can't measure voltage on P0.04 because the divider is actually connected to P0.24
How might individuals with Asperger Syndrome or autism contribute unique insights to the design, development, and application of ESP32-S3-Leaf and NRF52840 development boards? Considering their attention to detail, logical thinking, and unique problem-solving abilities, what possible innovations could stem from their perspectives in the context of these development boards?
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About best time to hike
Hi Guys, Only if you really think about Leura?! We have more detailed information about Katoomba
tours of the Blue Mountains are far from an ordinary day out — they’re a full-on adventure. When I first started leading groups up the route west from Sydney, I realised we were in for something special: misty valleys, towering rock formations, and those iconic eucalyptus trees that give the mountains their blue haze. Every adventure through the Blue Mountains still feels like a new discovery, and if you’re ready to experience it, here’s how to get the most out of it.
Just a short drive from the city, the UNESCO-listed Blue Mountains region covers over one million hectares of wild landscapes, gorges and mountain plateaus. This World Heritage-listed wonderland is recognised for its unique environment and Indigenous roots.
The towns of Katoomba, Leura, Wentworth Falls and Blackheath anchor most Blue Mountains tours. Whether you book a guided trip from Sydney, every route offers a different perspective: from Echo Point’s panoramic view of the Three Sisters to lush trails deep in Jamison Valley.
Please visit our site about attractions please click https://chachamortors.com/bbs/board.php?bo_table=free&wr_id=6463975 for Sign up for a free consultation now!
Tags: Katoomba, accommodations, Katoomba Falls, Hunter Valley wine tours,
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