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NE555P

5

This will be the 12V power supply

C

cmatsu5

This will be the 12V power supply

2y

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9

ensures the on state

C

cmatsu5

ensures the on state

2y

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12

handles the high current

C

cmatsu5

handles the high current

2y

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7

used to generate the 113kHz frequency

C

cmatsu5

along with the resistors and capacitors

2y

C

cmatsu5

used to generate the 113kHz frequency

2y

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8

This is supposed to be a OPA548 but there was no schematic

C

cmatsu5

This is supposed to be a OPA548 but there was no schematic

2y

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11

I can technically generate the freq directly by the raspberry pi, but that would...

C

cmatsu5

I can technically generate the freq directly by the raspberry pi, but that would limit other functions

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6

These resistors set the gain of the system to 3.64V or 12V/3.3V

C

cmatsu5

These resistors set the gain of the system to 3.64V or 12V/3.3V

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10

ensures the on state

C

cmatsu5

ensures the on state

2y

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R12

Resistance

4.7kΩ

R14

Resistance

1kΩ

R4

Resistance

10kΩ

R5

Resistance

1kΩ

R8

Resistance

4.7kΩ

R9

Resistance

1kΩ

R3

Resistance

10kΩ

R7

Resistance

10kΩ

R6

Resistance

5.6kΩ

V1

D3

5V relay

V2

M1

D2

D6

12V

Levcell

V3

M2

D1

K1

hot plate

12 V

MCP4725

U1

INA219

OPA548

IC1

U2

R13

Resistance

26.4kΩ

R1

Resistance

26.4kΩ

C1

Capacitance

10uF

IRF540

R16

Resistance

10kΩ

Piezeoelectric disk

U4

R2

Resistance

10kΩ

IRF540

C3

Capacitance

10nF

temperature sensor

C2

Capacitance

0.1uF

### Controlling the input voltage
import time
    from smbus2 import SMBus, i2c_msg
# Constants for the MCP4725
MCP4725_ADDR = 0x60  # Default I2C address for MCP4725, might vary
MCP4725_WRITE_DAC = 0x40
# Adjust as needed based on your OPA548 setup
V_MAX = 12.0
V_REF = 3.3  # Voltage reference for MCP4725, connected to 3.3V in this example
# Calculate the value to send to the MCP4725
def voltage_to_dac_value(voltage):
return int((voltage / V_REF) * 4095)
def set_voltage(bus, voltage):
value = voltage_to_dac_value(voltage)
    # Break the 12 - bit value into 2 bytes.
    byte1 = (value >> 4) & 0xFF
byte2 = (value & 0x0F) << 4
    # Write the value to the DAC.
    msg = i2c_msg.write(MCP4725_ADDR, [MCP4725_WRITE_DAC, byte1, byte2])
bus.i2c_rdwr(msg)
def main():
voltage = float(input("Enter desired voltage (0-12V): "))
if 0 <= voltage <= V_MAX:
    with SMBus(1) as bus:  # Change '1' to '0' on older RPi versions

Levcell_voltage_control