1.Description:

• It is a calculator DIY soldering module.
• It can perform addition,subtraction,multiplication,division,negative numbers,and decimal point operations.

2.Feature:

• It uses in-line components and is easy to solder.
• It doesn't require a computer,the calculator kit is pre-programmed.
• It is powered by a single CR2032 battery and can be carried anywhere without being tethered.
• It can be turned on instantly,turned on at any time,and easy to use.
• When not in use for a long time,it can automatically sleep,saving energy.

3.Parameter:

• Product Name:Calculator DIY Soldering Module
• Battery:CR2032
• Digital Precision:6 digits
• Welding Method: in-line component welding
• Work Temperature:-25℃~85℃
• Work Humidity:5%~95%RH
• Size:90x91x18mm

4.Precautions for Soldering and Installation:

• The components are soldered on the front of the board (screen printing surface),from low to high,that is,first low-solder components,such as mega328 (pay attention to the IC direction), capacitors, resistors, battery holders, then solder the switch, and finally solder the digital tube .
• Use diagonal pliers to cut the excess pins as short as possible.

5.Debugging Steps:

• Plug in the CR2032 battery,and the digital tube displays CAL 1.5,indicating that the welding is successful.
• Press the [C] Clear key to turn it on.
• The calculator turns itself off after about 20 seconds of inactivity.

6.Note:

• Up to 6 positive digits or 5 negative digits.
• Numbers are rounded up to four decimal places.Six decimal places can be entered,but like the result,they are rounded up.
• According to Arduino,only up to 6 digits of precision can be achieved.
• Can't do zero calculations,like 5 + 0.

7. Installation Manual

• Please download from the documents.