Introduction
The CAI-150 is a Multi-Functional Calculator Electronic Soldering DIY Kit. It is powered by two CR2032 button batteries and integrates five different computing functions. The kit features a traditional LCD1602 display screen to show the calculation process and results in real-time.
This kit serves not only as a DIY electronic welding project, allowing users to understand circuits and learn soldering techniques, but also as a practical experimental workbench tool.
Features
- Basic Arithmetic Calculator
- 4-Color or 5-Color Ring Resistance Calculator
- Calculate the working series resistor for LED
- Decimal to Hexadecimal conversion
- Hexadecimal to Decimal conversion
- Arithmetic Square Root Calculator
- Classic LCD1602 LCD Display Screen
- 4x5 Transparent Matrix Keyboard
- Automatic power off without operation within 30 seconds
- DIY Hand Soldering project
Parameters
- Work voltage: DC 6V
- Display Color: Blue/White Screen
- Power Type: 2 x CR2032 Battery (NOT Included)
- Work Temperature: -40℃ to 85℃
- Work Humidity: 5% to 95% RH
- Size (Installed): 126mm x 86mm x 36mm
Use Methods
Function-1: Basic Decimal Arithmetic Calculator
Supports decimal point and minus sign operations.
Example: Calculate the result of '5*6'.
- Press the [ON] button to power ON.
- Press the buttons '5', '*', '6', and '=' in sequence.
- The result '30' will be automatically calculated and displayed.
- Press the [AC] button to clear.
Example: Calculate the result of '-8+2'.
- Press the [ON] button to power ON.
- Press the buttons '-', '8', '+', '2', and '=' in sequence.
- The result '-6' will be automatically calculated and displayed.
- Press the [AC] button to clear.
Function-2: 4-Color or 5-Color Ring Resistance Calculator
Input the color of the metal film resistor surface in sequence to get the resistance value and error value.
Example: 5-Color Ring Resistor (Yellow, Violet, Black, Brown, Brown).
- Press the [ON] button to power ON.
- Press the [MODE] button to switch to the 'Color Ring R C 5' display interface.
- Press the buttons 'Yellow', 'Violet', 'Black', 'Brown', and 'Brown' in sequence.
- The results 'resistance value 4700ohm' and 'error value 1%' will be automatically calculated and displayed.
- Press the [AC] button to clear.
Example: 4-Color Ring Resistor (Green, Red, Yellow, Gold).
- Press the [ON] button to power ON.
- Press the [MODE] button to switch to the 'Color Ring R C 5' display interface.
- Press the [√] button to switch to the 'Color Ring R C 4' display interface.
- Press the buttons 'Green', 'Red', 'Yellow', and 'Gold' in sequence.
- The results 'resistance value 520Kohm' and 'error value 5%' will be automatically calculated and displayed.
- Press the [AC] button to clear.
Note: An operation error will display 'error'.
Function-3: Calculate Series Resistor for LED
Requires Circuit Work Voltage (Vi), LED Work Voltage (Vd), and LED Work Current (I) to calculate the series resistance (R).
Formula: R = U/I = (Vi - Vd) / I
Example: Circuit Work Voltage Vi = 5V, LED Work Voltage Vd = 3V, LED Work Current I = 10mA.
Resistor's work voltage is Vi-Vd = 5V - 3V = 2V.
- Press the [ON] button to power ON.
- Press the [MODE] button to switch to the 'Rled Vi-Vi= V I= mA R=' display interface.
- Press the [√] button to input LED Work Current.
- Press the buttons '1', '0', and '=' in sequence.
- The result 'resistance value 200ohm' will be automatically calculated and displayed.
- Press the [AC] button to clear.
Function-4: Decimal to Hexadecimal and Hexadecimal to Decimal
Example: Decimal to Hexadecimal (26 to 1A).
- Press the [ON] button to power ON.
- Press the [MODE] button to switch to the '10HEX-16HEX' display interface.
- Input the Decimal value (e.g., 26). A Hexadecimal value (e.g., 1A) will be automatically displayed.
- Press the [AC] button to clear.
Example: Hexadecimal to Decimal (D5A to 3418).
- Press the [ON] button to power ON.
- Press the [MODE] button to switch to the '10HEX-16HEX' display interface.
- Press the [√] button to switch to the '16HEX-10HEX' display interface.
- Input the Hexadecimal value (e.g., D5A). A Decimal value (e.g., 3418) will be automatically displayed.
- Press the [AC] button to clear.
Function-5: Arithmetic Square Root Calculator
Example: Calculate the value of '√4'.
- Press the [ON] button to power ON and display the Basic Decimal Arithmetic Calculator.
- Press the [√] button to switch to the '√0' display interface.
- Press the buttons '4' and '=' in sequence.
- The result '2' will be automatically calculated and displayed.
- Press the [AC] button to clear.
Battery Information
The kit is powered by two CR2032 batteries (NOT Included). Due to limited battery capacity, frequent use or prolonged standby may result in low battery power and inability to function properly. Please replace the batteries promptly.
Automatic Shutdown
The device automatically powers off after 30 seconds of inactivity.
Component Listing
| NO. | Component Name | PCB Marker | Parameter | QTY |
|---|---|---|---|---|
| 1 | IN4148 Diode | D1,D2 | DO-35 | 2 |
| 2 | Metal Film Resistor | R5 | 330ohm | 1 |
| 3 | Metal Film Resistor | R4 | 1Kohm | 1 |
| 4 | Metal Film Resistor | R1,R2,R3 | 10Kohm | 3 |
| 5 | 16Pin Male Pin | LCD1602 | 19mm | 1 |
| 6 | 16Pin Female Pin | LCD1602 | 1 | |
| 7 | Ceramic Capacitor | C4 | 0.1uF 104 | 1 |
| 8 | 7550A-1 Voltage Regulator | U1 | TO-92 | 1 |
| 9 | S8550 Transistor | Q1 | TO-92 | 1 |
| 10 | S9013 Transistor | Q2 | TO-92 | 1 |
| 11 | IAP15W413AS | U2 | DIP-28 | 1 |
| 12 | IC Socket | U2 | DIP-28 | 1 |
| 13 | CR2032 Battery Socket | BT2 | 2 | |
| 14 | Black Button | S1-S20 | 12*12mm | 20 |
| 15 | Blue Button Cap | S1-S20 | 20 | |
| 16 | Transparent Button Cap | S1-S20 | 20 | |
| 17 | Self Tapping Screw | 8mm | 4 | |
| 18 | Self Tapping Screw | 7mm | 8 | |
| 19 | LCD1602 Display Module | LCD1602 | 1 | |
| 20 | Black Shell | 2 | ||
| 21 | PCB Circuit Board | 220*68mm | 1 |
Note: Users can complete the installation according to the PCB silk screen and component list.
Schematic Diagram
The schematic diagram illustrates the connections between various components on the PCB. It shows the main microcontroller (U2, IAP15W413AS), voltage regulator (U1, HT7550-1), transistors (Q1, Q2), diodes (D1, D2), resistors (R1-R5), capacitors (C4), buttons (S1-S20), battery socket (BT2), and the LCD1602 display module. Power connections (+6V, +5V, GND) and signal lines (RX, TX, RS, R/W, EN, etc.) are detailed, indicating how these components interact to form the functional calculator.
Application
- Training welding skills
- Student educational tool
- DIY production projects
- Project design
- Electronic competitions
- Gift giving
- Crafts collection
- Home decoration
- Souvenir collection
- Graduation design projects
- Holiday gifts
Installation Tips
- Prepare necessary tools: Soldering iron (under 50 Watt), Rosin core solder, Wire cutters, Wire strippers, Screwdriver.
- Be patient throughout the installation process.
- This is a DIY kit requiring user assembly.
- Avoid touching components with the soldering iron for more than 1.0 second to prevent damage.
- Pay close attention to the polarity (positive and negative) of components.
- Strictly prohibit short circuits.
- Install LEDs according to specified rules to ensure they light up.
- Install complex components first.
- Ensure all components are correctly oriented and placed.
- Read the entire installation manual before starting.
- Wear anti-static gloves or wristbands when handling electronic components.
Installation Steps
Step 1: Install 3pcs 10Kohm Metal Film Resistor at R1,R2,R3.
Locate the PCB. Identify the positions marked R1, R2, and R3. Install three 10Kohm metal film resistors into these positions. Ensure they are seated correctly.
Step 2: Install 1pcs 1Kohm Metal Film Resistor at R4.
Locate the PCB. Identify the position marked R4. Install one 1Kohm metal film resistor into this position.
Step 3: Install 1pcs 330ohm Metal Film Resistor at R5.
Locate the PCB. Identify the position marked R5. Install one 330ohm metal film resistor into this position.
Step 4: Install 2pcs DO-35 1N4148 Diode at D1,D2.
Locate the PCB. Identify the positions marked D1 and D2. Install two 1N4148 diodes. Pay attention to the installation direction: the black band on the diode should align with the white mark on the PCB.
Step 5: Install 2pcs CR2032 Battery Socket.
Locate the PCB. Identify the positions for the battery sockets (BT2). Install two CR2032 battery sockets. Ensure correct orientation.
Step 6: Install 1pcs DIP-28 IC Socket at U2.
Locate the PCB. Identify the position marked U2 for the IC socket. Install one DIP-28 IC socket. Align the gap mark on the IC socket with the corresponding gap mark on the PCB silk screen for correct orientation.
Step 7: Install 1pcs 16Pin Female Pin at LCD1.
Locate the LCD1602 display module. Install one 16-pin female pin header onto the designated pins on the module.
Step 8: Install 1pcs 0.1uF 104 Ceramic Capacitor at C4.
Locate the PCB. Identify the position marked C4. Install one 0.1uF ceramic capacitor into this position.
Step 9: Install 1pcs DIP-28 IC IAP15W413AS at U2.
Locate the installed IC socket at U2. Install the IAP15W413AS IC into the socket. Align the gap mark on the IC with the corresponding gap mark on the socket and PCB for correct orientation.
Step 10: Install 1pcs TO-92 7550A-1 Voltage Regulator at U1.
Locate the PCB. Identify the position marked U1. Install the TO-92 7550A-1 voltage regulator. Align the arc on the component with the corresponding arc on the PCB for correct orientation.
Step 11: Install 1pcs TO-92 S8550 Transistor at Q1.
Locate the PCB. Identify the position marked Q1. Install the TO-92 S8550 transistor. Align the arc on the component with the corresponding arc on the PCB for correct orientation.
Step 12: Install 1pcs TO-92 S9013 Transistor at Q2.
Locate the PCB. Identify the position marked Q2. Install the TO-92 S9013 transistor. Align the arc on the component with the corresponding arc on the PCB for correct orientation.
Step 13: Install 20pcs 12*12mm Black Button at S1-S20.
Locate the PCB. Identify the button positions S1 through S20. Install twenty 12x12mm black buttons into these positions.
Step 14: Install 1pcs 16Pin Male Pin on the back side of LCD1602.
Take the LCD1602 display module. Install one 16-pin male pin header onto the back side of the module.
Step 15: Bend the metal pins inward as shown.
Hold the LCD1602 module with the pins facing down. Gently bend the pins inward.
Step 16: Ensure that the angle of pin bending is around 30°.
Verify that the bent pins have an angle of approximately 30 degrees.
Step 17: Insert LCD1602 display screen into the 16Pin Female Socket.
Align the pins of the LCD1602 module (with bent pins) with the 16-pin female socket on the main PCB. Press down gently to connect them.
Step 18: Cut Button Icon from paper instruction manual.
Cut out the individual button icons from the provided paper instruction sheet. These icons will be placed into the transparent button caps.
Step 19: Place the button icon in the transparent button cap.
Take a transparent button cap and place one of the cut-out button icons inside it. Tweezers can be helpful for precise placement.
Step 20: Insert the blue button cap into the transparent button cap.
Place the blue button cap over the transparent cap containing the icon.
Step 21: Install the blue button cap on Black Button as shown.
Install the assembled button (transparent cap with icon, plus blue cap) onto the corresponding black button switch on the PCB. Ensure buttons with different icons are placed in their specified positions.
Step 22: Install 2pcs CR2032 batteries as shown.
Locate the CR2032 battery sockets (BT2). Insert two CR2032 batteries. Ensure the positive electrode (+) of each battery contacts the metal spring of the battery holder.
Step 23: Place PCB on TOP case and adjusting the position of the buttons.
Carefully place the assembled PCB into the top case. Align the buttons and the LCD1602 display with their corresponding openings in the case. Ensure all buttons and the LCD are properly positioned.
Step 24: Fix PCB by 4pcs 7mm Self Tapping Screw.
Secure the PCB to the top case using four 7mm self-tapping screws. These screws typically go into designated mounting holes on the PCB.
Step 25: Fix LCD1602 Display Screen by 4pcs 7mm Self Tapping Screw.
Secure the LCD1602 display screen to the case using four 7mm self-tapping screws. These screws attach the LCD mounting points to the case.
Step 26: Fix Bottom case by 4pcs 8mm Self Tapping Screw.
Place the bottom case onto the assembled unit. Secure it using four 8mm self-tapping screws.
