The Elektor MultiCalculator Kit goes beyond basic calculations, offering 22 modes of operation including light and temperature measurement, differential temperature analysis, and NEC IR remote control decoding. This Arduino Pro Mini-based calculator is a great tool to use for your projects or for educational purposes. Take a look!

With a straightforward assembly process featuring through-hole components, the Elektor MultiCalculator Kit ensures reliability and ease of construction. The enclosure is made of 11 acrylic panels and is easy to assemble. Components include waterproof temperature sensors, a 16×2 alphanumeric LCD, and 20 labeled pushbuttons within a robust enclosure.
Elektor Multicalculator side
Side view after assembly
The MultiCalculator Kit addresses practical engineering applications such as capacitive and inductive reactance calculations, binary, decimal, and hexadecimal conversions, and resistance calculations in series and parallel configurations. It also features tools for project-specific needs, like a stopwatch with lap time functionality and a dice rolling simulator.
MultiCalculator PCB
The MultiCalculator is built around a Pro Mini and is programmable with Arduino IDE, via a 6-pin header on the back. The available software is bilingual, the menu language can be Dutch or English. The Arduino calculator is USB-C powered, and a USB-A to USB-C cable is included. Programming instructions (program adapter with USB-C connector is also included) and a temperature calibration mode ensure precise functionality. This kit provides a comprehensive, hands-on tool for in-depth exploration of various electronic concepts.
A look inside at the arduino pro mini
Twenty transparent caps and all labels
Modes of operation (software v1.1):

1 – Calculator
2 – 4 Ring Resistor Code
3 – 5 Ring Resistor Code
4 – Decimal to Hexadecimal and Character (ASCII) conversion
5 – Hexadecimal to Decimal and Character (ASCII) conversion
6 – Decimal to Binary and Character (ASCII) conversion
7 – Binary to Decimal and Hexadecimal conversion
8 – Hz, nF, reactance Xc calculation
9 – Hz, µH, reactance Xl calculation
10 – Resistance calculation of two resistors connected in parallel
11 – Resistance calculation of two resistors connected in series
12 – Calculation unknown parallel resistor
13 – Temperature measurement
14 – Differential temperature measurement  T1&T2 and Delta (δ)
15 – Light measurement
16 – Stopwatch with lap time function
17 – Item counter
18 – Display IR NEC code from a remote control
19 – AWG conversion (American Wire Gauge)
20 – Rolling Dice
21 – Personalize startup message
22 – Temperature calibration

Download the extensive Construction and User Manual for more information. The manual covers the following and more: key components, tools needed, PCB assembly, LCD mounting, and module programming.

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