2.5V-4.2V input to 3.3V output – 1A Buck Boost Converter using LTC3441

This circuit can produce an output of 3.3V and 1A current continuously for a voltage input varying from 2.5V to 4.2V. The LTC3441 is a high efficient buck boost converter which plays a vital role in portable instrumentation because of its fixed frequency operation. This circuit produces the output from a single Li-ion battery. Multiple cells can also be used within the specified range of input voltage.

Features

  • Input(V): 2.5V DC to 4.2V DC
  • Output(V): 3.3V DC
  • Output load: 1A
  • PCB:21mmX12mm

2.5V-4.2V input to 3.3V output – 1A Buck Boost Converter using LTC3441 – [Link]

PicoDetector : a simple metal detector

Bruno Gavand build a simple metal detector using PIC12F683. He writes:

The idea of this circuit is to hack PIC oscillator circuit, by replacing the crystal by a coil : the frequency of the oscillator then depends on presence of metal near the coil, just like in a classic metal detector.

PicoDetector : a simple metal detector – [Link]

Smart sensors track fitness activity

STMicroelectronics’ LIS2DS12 3-axis accelerometer, LSM6DSL/M 6-axis inertial module, and new LSM303AH eCompass enable always-on fitness-tracking applications to operate longer and record progress more accurately. by Susan Nordyk @ edn.com:

These smart sensors help track movement continuously with minimal impact on device battery life by performing various motion-related calculations on-chip, instead of using the main system processor.

Smart sensors track fitness activity – [Link]

BFuse: Electronic Fuse for Breadboard

created this solution to make breadboard prototyping safer for components:

adjustable and programmable electronic fuse especially designed for breadboards – a breadboard fuse, or BFuse

BFuse: Electronic Fuse for Breadboard – [Link]

EasyESP-1: A beginner’s prototyping board for ESP8266

ESP8266 has made it possible for makers to develop IoT applications in much simpler and more inexpensive ways. EasyESP-1 is a new ESP8266 prototyping board, specially designed for beginners by Raj from Embedded Lab. With an onboard USB-to-Serial converter pre-installed, EasyESP-1 does not require any additional hardware to download your application firmware to the ESP8266 chip. The ESP module used in this development board is ESP-12E. All the I/O pins are broken out to 0.1” female headers for easy access, as well as to standard Grove connectors for connecting Grove sensors and other compatible modules. The 180-point breadboard further facilitates experimenting and testing of external circuits. You can buy EasyESP-1 from their Tindie Store.

EasyESP-1 makes ESP8266 prototyping easy

Features

  • Easy access to all GPIO pin through female headers and Grove connectors
  • On-board USB-UART chip for easy programming and debugging
  • 180-point breadboard for experimenting with test circuits
  • On-board 3.3V (800 mA) regulated power supply
  • Two tact switches for user inputs, and one output LED
  • Slide switch to enable/disable auto Wake Up feature during Sleep mode

For more details about EasyESP-1, visit Raj’s Page.

Redefining a new state-of-the-art in microampere current-sense amplifiers

Silicon Lab’s TS1100 and TS1101 current sense amplifier’s features discussed in this app note.

Sensing and controlling supply current flow are a fundamental requirement in most all electronic systems from battery-operated, portable equipment to mobile or fixed-platform power management and dc motor control. High-side current-sense amplifiers (or “CSAs”) are useful in these applications especially where power consumption is an important design parameter. New CSA developments offer even greater benefits in allowing engineers to save power without sacrificing performance.

Redefining a new state-of-the-art in microampere current-sense amplifiers – [Link]

+9V TO 60V PWM 2.3A SOLENOID VALVE DRIVER USING DRV101

The DRV101 is a low-side power switch employing a pulse-width modulated (PWM) output. Its rugged design is optimized for driving electromechanical devices such as valves, solenoids, relays, actuators, and positioners. The DRV101 module is also ideal for driving thermal devices such as heaters and lamps. PWM operation conserves power and reduces heat rise, resulting in higher reliability. In addition, adjustable PWM potentiometer allows fine control of the power delivered to the load. Time from dc output to PWM output is externally adjustable. The DRV101 can be set to provide a strong initial closure, automatically switching to a soft hold mode for power savings. Duty cycle can be controlled by a potentiometer, analog voltage, or digital-to-analog converter for versatility. A flag output LED D2 indicates thermal shutdown and over/under current limit. A wide supply range allows use with a variety of actuators.

+9V TO 60V PWM 2.3A SOLENOID VALVE DRIVER USING DRV101 – [Link]

Wireless sensor module speeds IoT product development

Using standard ICs and open software ecosystem from STMicroelectronics, Samtec has introduced its first Samtec nMode wireless sensor module. The production-ready solution allows engineers to remotely sense and measure inertial, environmental and acoustical parameters. By Graham Prophet @ edn-europe.com

The 13.5 x 13.5 mm nMode module contains a MEMS accelerometer, gyroscope, magnetometer, pressure sensor, and a MEMS microphone — all from STMicroelectronics. The small size suits the nMode to use as a standalone node for products such as wearables, gaming accessories, and smart-home or Internet-of-Things (IoT) devices.

Wireless sensor module speeds IoT product development – [Link]

Butterfly & Ladybug, STM32L4-Based Arduino-Programable Development Boards

Arduino boards are very useful for beginners to get started with building hardware projects. But at some point, more powerful controller than the Arduino’s 8 MHz one will be needed, featuring faster clock rate, floating point engine, and rich peripherals.

As Kris Winer found, the code editors and compilers for these controllers aren’t as simple as Arduino IDE. So using them may be a very frustrating experience.

Kris collaborated with Thomas Roell to solve that by developing new development boards that allow developers to use and program STM32L4 MCUs with the simplicity of Arduino IDE.

They started on Tindie with Dragonfly, a small (0.7” x 1.4”) development board for the high-performance, ultra-low-power line of 32-bit microcontrollers, STM32L4X6 family. Dragonfly uses the STM32L476RE 64-pin LQFP chip package with 512 kB of high-speed flash memory, 128 kB SRAM, running at up to 80 MHz with a single-precision floating point unit.

Dragonfly Development Baord

Two new boards are added to the Dragonfly family, the Butterfly and the Ladybug. These boards are small, low-cost development boards with simple, open-source designs that will allow approximately anyone to make use of the STM32L4 in their own custom applications. They rely on a single, inexpensive 32.768 kHz crystal oscillator and don’t require the ST-Link built into the STM32 Nucleo boards. Applications can be developed using the Butterfly and Ladybug development boards which provide access to all GPIOs and peripherals of the STM32L4.

Butterfly (Top) & Ladybug (Down) Development Boards

The Butterfly is 0.7” x 1.4” board and it uses the STM32L433 80 MHz ARM Cortex M4F 48-pin QFN package. While the Ladybug is 0.6” x 1.1” and uses the STM32L432 QFN package for more rational routing.

Technical specifications:

  • Microcontroller: STM32L4 ARM Cortex M4F
  • Clock speed: 1, 2, 4, 8, 16, 24, 32, 48, 64, 80 MHz
  • Operating voltage: 3.3V
  • I/O pin limits: most pins 5.0 V tolerant, 20 mA
  • Digital I/O pins: 22, with 11 PWM (Butterfly), 13, with 10 PWM (Ladybug)
  • Analog input pins: 6 (Butterfly), 5 (Ladybug), 12-bit ADC channels
  • Analog output pins: 2 12-bit DAC
  • RTC: 1 ppm accuracy
  • Flash memory: 256 KB SRAM: 64 KB
  • Voltage regulator: 3.3-5.5V input / 3.3V, 150 mA output
  • Dimensions: 1.4 x 0.7″ (Butterfly), 1.1 x 0.6″ (Ladybug)

A kickstarter campaign had been launched to increase the production volume to allow rock bottom pricing. But unfortunately, the campaign ended without reaching the specified goal.

Butterfly and Ladybug were designed for ultra-low-power applications and for small LiPo battery operation. There is a port for a JST battery connector on the board as well as a Vin at the board edge that connects to the battery anode so peripherals like haptic motors or displays can be powered directly from the battery, or the board can be directly powered from Vin.

Butterfly Board Pinout
Ladybug Board Pinout

The boards are fully open source so anyone can get the source files and make his own easily. To find more details about the project visit its page at hackaday, and at OSH Park.

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