Good morning.
I'm building a wireless thermometer with a LM34. Attached is the transmitting circuit, and I'd like some constructive comments.
Transmitter and Receiver modules: 433MHz RF Wireless Transmitter/Receiver
Transmitter:
JP1: 12v car battery.
JP2: Picaxe programming socket.
JP3: Transmitter power jumper. I'd like to have the option to choose between 5v and 12v for the transmitter. With 12v the range increases.
JP4: The TX module.
JP5: LM34 temperature sensor.
C1-C6: Bypass capacitors
R1: Value from datasheet (Picaxe manual)
R2: Value from datasheet (Picaxe manual)
R3: IC out=4.85v -> (4.8-2.1)/0.02=135.7Ohm -> 130 Ohm
Receiver:
JP1: 12v wall adapter
JP2: PICAXE programming socket
JP3: The RX module
JP4: 16x2 LCD module, with backlight
C1-C5: Bypass capacitors
R1: Value from datasheet (Picaxe manual)
R2: Value from datasheet (Picaxe manual)
R3: Contrast pot, value from datasheet
TP1-TP9: Testpoints for future use.
The plan is to get a reading from the LM34, and calculate the value from Fahrenheit to Celsius, and display it on a different circuits LCD. I got it working on the breadboard.
Any obvious errors/faults?
I'm building a wireless thermometer with a LM34. Attached is the transmitting circuit, and I'd like some constructive comments.
Transmitter and Receiver modules: 433MHz RF Wireless Transmitter/Receiver
Transmitter:
JP1: 12v car battery.
JP2: Picaxe programming socket.
JP3: Transmitter power jumper. I'd like to have the option to choose between 5v and 12v for the transmitter. With 12v the range increases.
JP4: The TX module.
JP5: LM34 temperature sensor.
C1-C6: Bypass capacitors
R1: Value from datasheet (Picaxe manual)
R2: Value from datasheet (Picaxe manual)
R3: IC out=4.85v -> (4.8-2.1)/0.02=135.7Ohm -> 130 Ohm
Receiver:
JP1: 12v wall adapter
JP2: PICAXE programming socket
JP3: The RX module
JP4: 16x2 LCD module, with backlight
C1-C5: Bypass capacitors
R1: Value from datasheet (Picaxe manual)
R2: Value from datasheet (Picaxe manual)
R3: Contrast pot, value from datasheet
TP1-TP9: Testpoints for future use.
The plan is to get a reading from the LM34, and calculate the value from Fahrenheit to Celsius, and display it on a different circuits LCD. I got it working on the breadboard.
Any obvious errors/faults?
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