FemtoBeacon ESP32-PICO-D4 wireless IMU coin

Femtoduino has designed a dime sized (18mm diameter) Wi-Fi/Bluetooth wireless IMU (inertial measurement unit) that runs MicroPython:

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FemtoBeacon ESP32-PICO-D4 (4MiB) wireless IMU coin

What is it?

The world’s smallest open-source Wireless IMU. It has an ICM-20948 MPU (9-axis: accelerometer, gyroscope, magnetometer), and an MS561101BA03-50 precision altimeter/temperature sensor.

The coin uses the ESP32-PICO-D4 chip (4MiB) and has all peripherals attached via SPI (hSPI).

Requires a USB to UART adapter that can provide pass-through 5V to coin VIN pin and at least 500mA to 3V3 pin.

Pin Out:

  • RGB LED, Red pin: 26
  • RGB LED, Green pin: 4
  • RGB LED, Blue pin: 5
  • hSPI SCK pin: 14
  • hSPI MOSI pin: 13
  • hSPI MISO pin: 12
  • MPU Chip Select pin: 15
  • Altimeter Chip Select pin: 27

Why did you make it?

I made these for use in personal projects where I need a very small motion processing unit.

What makes it special?

It’s incredibly small, light weight, and open source!

FemtoBeacon ESP32-PICO-D4 wireless IMU coin

Breakout board for 8×12 analog cross-point switch

J. Ian Lindsay of  Manuvr Breakouts has designed this breakout board for Analog Devices’ 8×12 analog cross-point switch:

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ADG2128 Breakout

The ADG2128 is an incredibly flexible cross-point switch. It supports 5/-5v, 3.4MHz i2c, and is unrestricted as to its connectivity options between its rows and columns.

This is a high-dollar part, and I’ve been designing with it for more than 5 years. So I polished my breakout board to reuse them during a project’s prototyping phase.

This board has decoupling capacitors adequate to handle the whole analog voltage range, i2c address selection jumpers, and differentiated ground layers for noise isolation or differential operation below 0v, according to the project’s demands.

 

Breakout board for 8×12 analog cross-point switch

BreadboardBuddy Pro

BreadboardBuddy Pro from AtomSoftTech on Tindie:

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What is the Breadboard Buddy Pro

The BBBPro is a 4 in 1 breadboard tool. The amount of time you save using this is crazy! Ive been using my original Breadboard Buddy for years and the main addition is the newer CP2104 and Lipo Charging.

The board can be broken down into four main parts.

USB Power, USB 2 UART, LIPO Charger, Reset Button.

USB Power

Using a MicroUSB cable you can supply the board with its power. The board can output 5v and 3.3v simultaneously. Using the Jumpers on each of the top corners you can select which supply goes to which rail on breadboard.

If using a battery please note that there will obviously be no 5v supply. You can take 4.2 (or what ever the voltage on battery may be) from the BATT pin. Otherwise it will supply power to the 3.3v regulator and you can still use that on the power rails.

USB 2 UART

The USB to UART uses the CP2104, its a beautiful less expensive part than the FT232RL. It has a RX and TX led for indication of data transmission and reception. Supports 5/6/7/8 Data bits, Stop Bits 1/1.5/2, Parity odd/even/mark/space/none, Baud Rates 300bps to 2Mbits. Has a 576 transmit and receive buffer.

Lipo Charger

Uses the widely known and trusted MCP73831 for lipo charging. These ICs are so popular and tested so much that it almost guarantees your battery will be charged safely. The same charging circuit is used by other suppliers of similar circuits. What makes mines special is the ability to still supply power to circuit while charging, without crossing the voltage. Has a option for 100mA or 500mA charging on bottom. (Solder Jumper)

Reset Button

Just about any breadboard user knows how important a reset button can be. Using DIP MCUs are awesome for prototyping but all these extra components can take up so much space. This button isnt taking any space away. Also its pull up to 3.3v or 5v so you MCU is safe. (please ensure you select correct voltage on solder jumper on bottom) Can be used as a General Purpose pulled up button as well.

BreadboardBuddy Pro

Low-cost Amateur Radio SDR Receiver

writes on the Tindie blog about a DSP-based radio that can receive SSB:

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Low-cost Amateur Radio SDR Receiver

As an amateur radio operator, I am always keeping an eye out for cool new radio-related things to tinker with. Hams have a long tradition of building and designing their own radios, and it’s great to see this still happening in the digital era. This DSP-based radio can receive SSB (single sideband) over almost the entire amateur HF band. This band spans from 1.9 MHz (also called 160 meters) all the way up to 28 MHz (10 meters) and everything in between.

This is a great radio for portable use. Paired with a small CW (continuous wave, the mode used for Morse code) transmitter, it would make a great QRP set for those who love low-power Morse communication. Bandwidth can be adjusted from 500Hz to 4kHz, which is perfect for CW as well as digital modes. The designer specifically designed it to be used with the extremely popular new digital mode FT-8, and it indeed fits the specifications very well. It could also be used for many other digital modes, including PSK, RTTY, JT65, and many more! The audio output can be wired directly into any PC — even a Raspberry Pi — to enable digital reception modes.

Low-cost Amateur Radio SDR Receiver

Neopixel Rotary Encoder

Here’s a neat rotary encoder with a ring of RGB Neopixel LEDs to indicate where its pointing:

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Neopixel Rotary Encoder

What is this?

This is a super-overkill rotary encoder. Not only does it encode in a rotary fashion, it also lights up! It includes a ring of 20 ultra bright and even more ultra tiny Neopixel LEDs. Ever have trouble deciding between different LED colors? Well here you don’t have to. Add this to your next project to give it a brilliant flare in whatever color, or combination of colors, you want.

What can I use it for?

I originally designed this to control digital effects in a guitar. Because the knob would potentially be mapped to several different controls, depending on the active effect, an ordinary potentiometer wouldn’t cut it. What if, for example, in one mode it was set to 50%, and in another it was set to 100%? Enter the LED ring. Now, whenever you change modes, the indicator can reflect the correct value.

But what can it actually do?

Anything! Assuming that ‘anything’ refers to reporting positions from a rotary encoder, acting as a pushbutton, or lighting up. The lights don’t do anything on your own, you need to include some code in your project that takes the encoder signal and does something with the lights. Thankfully, I already wrote that part for you! Here are a few examples of different modes I prepared for you, all of which are included in the example code.

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Neopixel Rotary Encoder

RC2014 Homebrew Z80 Computer Kit… now in After Dark!

The RC2014 is a Z80 based modular homebrew.  The designer Spencer Owen recently did a version with our After Dark service (clear solder mask on black substrate) and it is available on Tindie:

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Special edition Z80 based retro computer kit with stunning After Dark PCB

Fundamentally, this is an RC2014 Mini. A single board Z80 computer that runs BASIC or Z80 assembly code. If you are looking for an easy to build, good looking, well supported Z80 single-board computer, you probably should just go and buy a RC2014 Mini

However, if you are after a stunning looking Z80 single board computer which is one of only 25 in the world, then read on…

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Limited Edition RC2014 Mini After Dark

  • Amazingly beautiful AfterDark PCB from OSHPark features black FR4 substrate, 1oz copper with clear solder resist, ENIG (gold) pads and white silkscreen
  • Every track from the original RC2014 Mini has been relaid for maximum visual appeal
  • RC2014 logo in the top copper layer
  • Turned pin chip sockets
  • White connectors, jumpers and reset switch to compliment the silkscreen
  • Laser-cut mirrored base plate with brass PCB standoffs allow the underside of the board to be seen
  • Rubber mounting feet
  • Limited run of 25 kits, with each one being numbered. Kits will be supplied strictly in number order and records kept if later verification is required
  • Option to buy a standard RC2014 Mini with a 50% discount so you can hack around and modify the standard RC2014 Mini whilst leaving the Limited Edition RC2014 Mini After Dark kit intact. Or mix & match the black and white connectors to create your own unique RC2014.
  • Same specification as standard RC2014 Mini (Z80 processor at 7.3728MHz, 32k RAM, ROM with Microsoft BASIC / SCM Monitor, 5v power over USB barrel jack cable or FTDI cable, 115,200 baud serial communication, keyboard connector for Universal Micro Keyboard, Pi Zero header option for Pi Zero Serial Terminal
  • Luxury packaging for that unique “unboxing experience”
  • Shipping will automatically be upgraded to signed, tracked or recorded delivery based on your location
  • Limited run RC2014 After Dark stickers

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RC2014 Homebrew Z80 Computer Kit… now in After Dark!

Penguino Feather SAMR34 LoRa Dev-Board

Orkhan AmirAslan on Hackaday.io has created a RAK4260 based, Feather styled LoRa dev-board:

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Penguino Feather SAMR34 LoRa Dev-Board

This is a SAMR34 based LoRa dev-board with all the necessary components for fast prototyping. It’s a successor of my previous Penguino RF module and Feather breakout design ( https://www.tindie.com/products/16985/ )The new design uses the RAK4260 module from @RAKWireless and improves on some aspects, such as USB Type-C, RGB LED, user button, battery protection & voltage supervision, and optional flash & per-provisioned secure element IC pads.

Background:

About a year ago, after I first saw SAMR34 System in Package (SiP) in 2018 Electronica I couldn’t find a module for it and I took up the challenge for myself to build one myself. Then sharing first renders with the Twitterverse it gathered quite a bit of interest and I started selling couple over at my Tindie store. At the time I named the project TinyLoRa but for legal reasons I had to change it to Penguino.

Specs:

  • ATSAMR34J18 LoRA System-in-Package (SiP) based RAK4260
  • ARM Cortex M0+ MCU & SX1276 LoRa Radio
  • 256KB Flash, 40 KB RAM
  • Max Tx Power: +20 dBm; Max Sensitivity: -148dBm; Rx Current: 17mA (typical)
  • Frequency Range: 862 to 1020 MHz (DS values)
  • Deep Sleep Current: ~1 μA (module only)
  • Li-Po battery charging IC
  • RGB user LED, Battery Charge Status (red) and Power (blue) (w/ cut-off jumpers)
  • 3.3V low Iq LDO (~1 μA)
  • Low-voltage battery cut-off supervisor IC (3V Vbat cutoff)
  • USB Type-C connector with protection/filtering circuit
  • 0.75 A resettable fuse
  • Voltage divider for Vbat monitoring (w/ cut-off jumpers)
  • SMA and u.FL antenna connectors
  • 10-pin SWD programming header
  • Dimensions: 2 in. x 0.9 in. (50.8 mm x 22.8 mm)

Penguino Feather SAMR34 LoRa Dev-Board