Schematic for Weak Coffee Tricorder

Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
A net identifier used to create connectivity to other Net Portal with the same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Power net portal is a special schematic object used to define a power or ground net. Power ports allow you to conveniently indicate a power net at any location in the design. Power nets of the same designator automatically connect throughout your design #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
jharwinbarrozo
14.3k
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

at mega 328p req constant 5 v and i need to protect it from reverse current , sp...

@copilot at mega 328p req constant 5 v and i need to protect it from reverse current , spike current and spike voltage how to do it it i am using l7805 for constant 5v and atmega min requirment of current is 0.5 amps

6mo

copilot

To ensure that your ATmega328P receives a stable 5V supply and is protected from reverse current, spike current, and spike voltage, you can use several components in conjunction with the L7805 voltage regulator:

Reverse Current Protection:
- Use a Schottky diode like 1N5819 in series with the input of the L7805 to prevent reverse current. Schottky diodes have a low forward voltage drop and fast switching.
Spike Voltage Protection:
- Use transient voltage suppression (TVS) diodes like P6KE6.8A across the power supply input to clamp any spike voltages and protect the circuit.
- Additional capacitors can help filter out high-frequency noise: a 100nF ceramic capacitor close to the ATmega328P and a larger electrolytic capacitor, e.g., 220uF, at the input side of the L7805.
Current Spikes Protection:
- Use a capacitor at the output of the L7805 to smooth out any current spikes. Typically, a combination of a 100nF ceramic capacitor and a 10uF or higher electrolytic capacitor near the microcontroller can help.

Schematic Connections

Place D1 (1N5819) in series with the input of the U1(L7805):
- Connect D1:Anode to the power supply input.
- Connect D1:Cathode to U1:VIN.
Place TVS1 (P6KE6.8A) across the power supply input:
- Connect TVS1:Anode to ground.
- Connect TVS1:Cathode to the power supply input.
Place a 220uF electrolytic capacitor (C1) across U1:VIN and ground:
- Connect C1:Positive to U1:VIN.
- Connect C1:Negative to ground.
Place capacitors at the output of U1:
1. Connect C2:Positive (10uF electrolytic) to U1:VOUT and C2:Negative to ground.
2. Connect C3:Positive (100nF ceramic) to U1:VOUT and C3:Negative to ground.
Connect U1:VOUT to the Vcc pin of the ATmega328P.
Place an additional C4 (100nF ceramic capacitor) between Vcc and ground near the ATmega328P for decoupling.

Complete Connections List

Connect D1:Anode to your power supply input.
Connect D1:Cathode to U1:VIN.
Connect TVS1:Anode to ground.
Connect TVS1:Cathode to the power supply input.
Connect C1:Positive to U1:VIN.
Connect C1:Negative to ground.
Connect U1:GND to ground.
Connect C2:Positive to U1:VOUT.
Connect C2:Negative to ground.
Connect C3:Positive to U1:VOUT.
Connect C3:Negative to ground.
Connect U1:VOUT to ATmega328P:Vcc.
Connect ATmega328P:GND to ground.
Connect C4:Positive to ATmega328P:Vcc.
Connect C4:Negative to ground.

These connections should help ensure that your ATmega328P is well protected from reverse polarity, voltage spikes, and current surges while maintaining a stable 5V supply.

Feel free to make adjustments based on your specific requirements and circuit layout. If you need further help with your Flux schematic, please let me know!

6mo

i want to protect At mega 328p from surge current so i am using one lm358 voltag...

piyush0

@copilot what is tvs diode

6mo

copilot

A Transient Voltage Suppression (TVS) diode is a device designed to protect electronic circuits from transient voltage spikes, such as those caused by lightning, electrostatic discharge (ESD), or inductive switching. Here are some key points about TVS diodes:

Operation: A TVS diode remains in a non-conductive state under normal operating conditions. However, when a transient voltage spike exceeds a certain threshold, it becomes conductive, clamping the voltage to a safe level and diverting the excess energy away from the protected components.
Types:
- Unidirectional: Used for circuits with only one polarity of voltage.
- Bidirectional: Used for AC circuits or DC circuits where the transient could be of either polarity.
Applications: Often found in communication lines, power supplies, and any other sensitive electronic circuits that need protection from transient voltages.
Symbol: The symbol for a TVS diode is similar to that of a Zener diode but may have additional markings to indicate its transient suppression capabilities.

TVS diodes are crucial for maintaining the reliability and longevity of electronic systems by protecting them from potentially damaging spikes in voltage.

If you have a particular TVS diode or application in mind, feel free to share more details for targeted advice!

6mo

piyush0

What is tvs diode

6mo

piyush0

@copilot i want to protect At mega 328p from surge current so i am using one lm358 voltage regulator to get constant voltage from 12v to 5v and then i am using this 5 v as a input in buffer of lm358 opamp and get the voltage of 4.99 so according to datasheet of atmega its min requirement of current is srounf 0.5 amp while in this set up i am getting the 0.25 amp in input of power supply of at mega so is it good or i should increase the input current will atmega fail to operate at high operations. It is done to protect atmega from pulse current to protect it is there any different aproach . And also what to do to protect it from reverse current

6mo

copilot

First, let's clarify a few things about your design, then we can discuss protection mechanisms.

Voltage Regulation: You're using the LM358 op-amp as a buffer, but I think you might be confusing it with a voltage regulator. The LM358 isn't typically used for voltage regulation. For direct voltage regulation from 12V to 5V, you'd typically use an actual voltage regulator like the LM7805 or a switching regulator like the LM2596.
Current Requirements: The ATmega328P typically requires around 0.5A (500mA) for stable operation. If you are only providing 0.25A (250mA), the microcontroller might not operate reliably under full load or when all peripherals are being used.
Surge and Pulse Protection:
- Decoupling Capacitors: Use decoupling capacitors close to the ATmega328P’s power pins. Typically, a 0.1μF ceramic capacitor and a 10μF electrolytic capacitor.
- Transient Voltage Suppression (TVS Diode): Use a TVS diode like (PESD5V0S1UL) on the input to clamp high voltage spikes.
- Series Inductor: Add an inductor in series with the power line to filter out high-frequency interference.
Reverse Current Protection:
- Use a Schottky diode like the 1N5819 in series with the power supply line to prevent reverse current.
- Alternatively, use a P-channel MOSFET with the correct orientation in the power line as a reverse polarity protection switch.
Improved Voltage Regulation Setup: Consider a more suitable voltage regulation setup:
- 12V to 5V Regulator: Instead of the LM358, use a proper voltage regulator: LM7805.
- Voltage Protection: Include a PESD5V0S1UL TVS diode and proper decoupling capacitors.
- Reverse Protection: Add a 1N5819 diode.

Improved Power Supply Schematic:

Regulation: 12V input to LM7805 outputting 5V.
Reverse Polarity Protection: 1N5819 diode in series with the 12V input.
Decoupling: 0.1μF and 10μF capacitors across 5V outputs.
Surge Protection: PESD5V0S1UL TVS diode across the 5V output.

Implementation

Power Input Circuit:
- Connect 12V input to 1N5819 Anode.
- Connect 1N5819 Cathode to LM7805 Input.
- LM7805 Output connects to ATmega328P Vcc pin.
- TVS diode PESD5V0S1UL across the 5V output.
- Place a 0.1μF capacitor close to the ATmega328P Vcc and GND pins.
- Place a 10μF electrolytic capacitor close to the LM7805 output.

Would you like a more detailed schematic? If so, I can help to draw it up in Flux.

6mo

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piyush0 / Weak Coffee Tricorder

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