PCB Design for 3-Phase Current Monitoring
Budget: ₹1,500 – ₹12,500 INR
Design a pcb that monitors 3phase current continuously if there is any phase drop or current loss it must initiate the user with call and sms and the pcb must have the following
#
# Component Value/Part No. Package Qty Description
1 Microcontroller STM32H743ZI LQFP-144 1 Main MCU
2 Power Monitor IC ADE7758 SSOP-28 1 3-phase energy metering IC
3 LoRa Module E32-900T30D Module 1 868/915 MHz LoRa Module
4 SIM Module SIM7600 Module 1 4G LTE Communication
5 LCD Display 2.8” TFT (SPI/I²C) HMI Display 1 Displays current, voltage, alerts
6 GPS Module (optional) NEO-6M Module 1 GPS Location (optional)
7 External Siren 12V Siren - 1 Local alert on fault
8 TVS Diode SMBJ440CA SMB 3 Line protection per phase
9 MOV S14K420 Disc 3 Surge protection on AC lines
10 Burden Resistor 10Ω, 1W Axial 3 CT burden resistor
11 CT (Current Transformer) SCT-013-000 Clamp-on 3 3-phase current sensing
12 Voltage Divider Resistors 1MΩ / 10kΩ 0805 6 Voltage sensing divider
13 Protection Zeners 5.1V Zener DO-35 3 Clamp voltage in divider
14 Low Pass Filter Capacitors 100nF 0805 3 With divider resistor
15 RC Filter for CT 1kΩ + 100nF 0805 3 Filters CT signal
#
Component
Model/Series
Package
Qty
Description
16
Logic Level MOSFET
IRLZ44N or AO3400
TO-220/SOT23
3
Controls siren/relay
17
Relay
12V SPDT
-
1
Controls external device
18
SWD Debug Header
4-pin 2.54mm
Header
1
For flashing/debugging via ST-Link
19
Buzzer (Optional)
3.3V/5V Buzzer
Through-hole
1
Audible local alert
20
Microphone (optional)
Digital MEMS (I’S)
-
1
Audio input for environment sound monitoring
21
Speaker Driver + Speaker
MAX98357A + 8¿
Module
1
Audio output for alarms
22
Power Supply Regulator
LM2596 or similar
Module
1
12V/5V to 3.3V/5V supply
23
Capacitors (Bypass, bulk)
0.1uF, 10uF, 100uF
0805
20
Power stability
24
LEDs (Status Indicators)
Green, Red, Blue
0805
3
Status indication (Power, Fault, Comm)
25
Diodes (General Purpose)
1N5819 or 1N4148
DO-35
5
Flyback and reverse polarity
26
Crystal Oscillator
25 MHz or 8 MHz
SMD/HC-49S
1
External clock for STM32
27
Push Button
Tactile Switch
SMD/TH
2
Reset / Manual Trigger
28
Connectors (Power, CT, LoRa)
Screw Terminal/PinHdr
-
10
All external interfaces
29
Fuse
500mA 1A Slow Blow
Axial
1
Input protection
#
# Component Value/Part No. Package Qty Description
1 Microcontroller STM32H743ZI LQFP-144 1 Main MCU
2 Power Monitor IC ADE7758 SSOP-28 1 3-phase energy metering IC
3 LoRa Module E32-900T30D Module 1 868/915 MHz LoRa Module
4 SIM Module SIM7600 Module 1 4G LTE Communication
5 LCD Display 2.8” TFT (SPI/I²C) HMI Display 1 Displays current, voltage, alerts
6 GPS Module (optional) NEO-6M Module 1 GPS Location (optional)
7 External Siren 12V Siren - 1 Local alert on fault
8 TVS Diode SMBJ440CA SMB 3 Line protection per phase
9 MOV S14K420 Disc 3 Surge protection on AC lines
10 Burden Resistor 10Ω, 1W Axial 3 CT burden resistor
11 CT (Current Transformer) SCT-013-000 Clamp-on 3 3-phase current sensing
12 Voltage Divider Resistors 1MΩ / 10kΩ 0805 6 Voltage sensing divider
13 Protection Zeners 5.1V Zener DO-35 3 Clamp voltage in divider
14 Low Pass Filter Capacitors 100nF 0805 3 With divider resistor
15 RC Filter for CT 1kΩ + 100nF 0805 3 Filters CT signal
#
Component
Model/Series
Package
Qty
Description
16
Logic Level MOSFET
IRLZ44N or AO3400
TO-220/SOT23
3
Controls siren/relay
17
Relay
12V SPDT
-
1
Controls external device
18
SWD Debug Header
4-pin 2.54mm
Header
1
For flashing/debugging via ST-Link
19
Buzzer (Optional)
3.3V/5V Buzzer
Through-hole
1
Audible local alert
20
Microphone (optional)
Digital MEMS (I’S)
-
1
Audio input for environment sound monitoring
21
Speaker Driver + Speaker
MAX98357A + 8¿
Module
1
Audio output for alarms
22
Power Supply Regulator
LM2596 or similar
Module
1
12V/5V to 3.3V/5V supply
23
Capacitors (Bypass, bulk)
0.1uF, 10uF, 100uF
0805
20
Power stability
24
LEDs (Status Indicators)
Green, Red, Blue
0805
3
Status indication (Power, Fault, Comm)
25
Diodes (General Purpose)
1N5819 or 1N4148
DO-35
5
Flyback and reverse polarity
26
Crystal Oscillator
25 MHz or 8 MHz
SMD/HC-49S
1
External clock for STM32
27
Push Button
Tactile Switch
SMD/TH
2
Reset / Manual Trigger
28
Connectors (Power, CT, LoRa)
Screw Terminal/PinHdr
-
10
All external interfaces
29
Fuse
500mA 1A Slow Blow
Axial
1
Input protection