May 2017

The Micromite LCD Backpack

The Micromite is a low-cost 32-bit MCU programmed in a Microsoft-compatible version of the BASIC interpreter, with non-volatile memory, floating point, arrays and extensive string handling to name just a few benefits. It arrives in 28-pin DIL or 44-pin SMD packages and can be interfaced to many devices including touch screens and a wide range of sensors. It’s also compatible with Microchip PICkit 3 and best of all – it’s cheap as chips!

We introduced the Micromite to EPE readers in the February-April 2017 issues and this followup LCD BackPack lets you add a full colour touchscreen 320 x 240 pixel LCD to your next Micromite project. Full construction, programming and testing methods are described.

Arduino Multifunction 24-bit Measuring Shield (Part 2)

Measure voltages, decibels and power levels with this low-cost Arduino-based PC measuring system. It has four accurate DC ranges and an AF level and power meter, plus an optional RF level and power meter that can operate up to 500MHz.  It links to a PC (Windows 7+) via USB, and captured data can be logged in .csv format for later analysis.  Arduino Uno (or similar) based, 24-bit resolution.  Installation, firmware and usage guide notes are offered in Part 2 this month.

Precision Turntable Driver

Suitable for 230V/ 115V and 50Hz/ 60Hz frequencies, this precision turntable driver module will power belt-driven or idler wheel turntables. It features an adjustable pitch control over a range of 12% which is great for music- or dance-teaching applications.

It can be used with a 12-15V DC supply or car battery, has a 115V/ 230V sinewave output and is crystal-controlled for accuracy. PIC 16F88 microcontroller powered with program file available from our Library.

Also see our Turntable Strobe project February 2017.

Also in this issue

• Techno Talk – how the impact (literally) of cosmic rays can affect microelectronics
• Net Work – trends in home network printing, new OwlDetect data theft alert, Amazon Fire TV Stick gets Alexa.
• Review: Smith & Larson Audio Woofer Tester 2 – find Thiele Small speaker parameters in seconds with this hardware/ software combo
• Interface – visiting the new BBC micro:bit
• PIC n’ MIX – PICs and the PICkit 3: A Beginner’s Guide (Part 10) – Interrupts and Pull-Ups. Our PIC micro specialist brings you more tutorials and insights into using Microchip’s powerful microcontroller.
• Circuit Surgery – our popular ‘electronics surgeon’ explains everything you need to know about logic timing and timing diagrams
• Audio Out – reverse-engineering the circuit of an MX50 power amplifier kit sourced online
• Readout – a roundup of readers’ letters
• Max’s Cool Beans – Max’s prodigious productivity is transformed by a new stylus and handwriting app combo for his iPad.

Next month

Teach-In 2017 Introducing the BBC micro:bit (Part 1); Ultrasonic Garage Parking Assistant; Hotel Safe Alarm; 100dB Stereo LED VU Meter (Part 1);