Chat

Welcome to Flux

Treat Flux like your intern. Tell it what you'd like to build and it'll get to work. You can also ask it questions, brainstorm ideas, and teach it your preferences. Learn More

Explain project
Write a project description
Find schematic issues
Create a test plan
Simulate a circuit
Prepare for Manufacturing
Component Selection Workflow
New Subsystem Wizard

Ready.

Sign up to send
can you give me advise which transitor is best for switching 5V usb voltage in o...
pmamatis

pmamatis

@copilot can you give me advise which transitor is best for switching 5V usb voltage in order to drive waterpumps with 300mA
1y

copilot

For switching a 5V USB voltage to drive a waterpump with a current requirement of 300mA, I recommend using a N-channel MOSFET due to its high efficiency, lower voltage drop, and simplicity for such an application. A good choice would be to select a logic-level MOSFET, as it will be fully turned on (saturated) at the lower gate voltages provided by microcontroller GPIO pins, such as those on the ESP32.
Here are two commonly recommended logic-level N-channel MOSFETs for your requirements:
  1. IRLZ34N
    • Threshold Voltage (Vgs(th)): Typically around 1V to 2V, ensuring it fully turns on at the 3.3V logic level available from the ESP32.
    • Continuous Drain Current (Id): Greater than 300mA, specifically around 30A, which is way more than what's required for your application but provides a good safety margin.
    • Rds(on): Very low on-resistance, ensuring minimal power loss across the MOSFET when on.
  2. 2N7000
    • Threshold Voltage (Vgs(th)): Approximately 2.1V, making it suitable for logic-level operation as well.
    • Continuous Drain Current (Id): Up to 200mA, which is slightly lower than your requirement. For a safety margin, it's often recommended to use components rated for higher than the actual anticipated current. Therefore, consider this option if your water pump can operate slightly below 300mA or if you can find a variant or similar MOSFET with a higher current rating.
    • Rds(on): Slightly higher on-resistance compared to power MOSFETs but still acceptable for low current devices.
Given that the 2N7000 is on the edge of your current requirements, I'd lean towards recommending the IRLZ34N for its higher current capacity, low Rds(on), and overall headroom for your application. This will ensure reliable operation and reduce the chances of overheating and failure.
When interfacing this MOSFET with your ESP32, ensure you include a pull-down resistor (10kΩ is a common choice) between the gate of the MOSFET and ground to prevent the MOSFET from turning on unexpectedly when the ESP32 pin is in a high-impedance state (i.e., during reset or not actively driven).
Connecting the MOSFET:
  • Gate: Connect to ESP32, for example, U1:D5 (assuming D5 will be the control pin)
  • Drain: Connect to one of the waterpump terminals.
  • Source: Connect to GND.
  • Pump's other terminal: Connect to the positive side of your 5V power supply.
And, of course, do not forget to connect the ground of the 5V power supply to the ESP32's ground to ensure a common reference point for all components in your circuit.
1y
pmamatis

pmamatis

can insert the Mosefets 2N7000 and already connect them to GPIOs of the ESP32?
1y

copilot

Certainly! I'll guide you through inserting two MOSFETs of type 2N7000 into your project and connecting them to GPIOs of the ESP32 for control. Based on the list of available pins, I'll use D5 and D18 GPIOs for these connections. Let's assume each MOSFET will drive a separate water pump, requiring a control signal.
Project Update with 2N7000 MOSFETs
Components to Add:
  • Q1: 2N7000 MOSFET for water pump 1
  • Q2: 2N7000 MOSFET for water pump 2
Connections:
  • Connecting Q1 (MOSFET for water pump 1):
    • Connect U1:D5 (GPIO for control) to Q1:Gate.
    • Connect Q1:Drain to one terminal of water pump 1.
    • Connect Q1:Source to U1:GND (common ground).
    • The other terminal of water pump 1 should be connected to the positive side of the 5V power supply.
  • Connecting Q2 (MOSFET for water pump 2):
    • Connect U1:D18 (another GPIO for control) to Q2:Gate.
    • Connect Q2:Drain to one terminal of water pump 2.
    • Connect Q2:Source to U1:GND (common ground).
    • The other terminal of water pump 2 should be connected to the positive side of the 5V power supply.
Additional Components:
Make sure to add a pull-down resistor between the gate and source pins of each MOSFET to ensure they remain off unless explicitly driven by the ESP32:
  • R1: 10kΩ, connect between Q1:Gate and Q1:Source.
  • R2: 10kΩ, connect between Q2:Gate and Q2:Source.
This configuration ensures that the MOSFETs are in their OFF state when the ESP32 GPIOs are not actively driving them, preventing unintended water pump activation due to floating gate voltages.
Summary of New Connections:
  • Connect U1:D5 to Q1:Gate.
  • Connect Q1:Source to U1:GND, and Q1:Drain to Water Pump 1 (+ terminal).
  • Connect R1:1 to Q1:Gate and R1:2 to Q1:Source.
  • Connect U1:D18 to Q2:Gate.
  • Connect Q2:Source to U1:GND, and Q2:Drain to Water Pump 2 (+ terminal).
  • Connect R2:1 to Q2:Gate and R2:2 to Q2:Source.
Remember: The negative terminal of each water pump should be connected to the 5V power supply's ground, which must be shared with the ESP32's ground to complete the circuit.
1y
3
J2
R1
Resistance
10kΩ
J1 P2 - U1 GND
R4
Resistance
10kΩ
Q3
R3
Resistance
10kΩ
U1
Q2
J1 P2 - U1 GND
Q1
Q5
5V
J5
J1 P2 - U1 GND
5V
J1 P2 - U1 GND
5V
5V
J1 P2 - U1 GND
J4
5V
R2
Resistance
10kΩ
R5
Resistance
10kΩ
J1
J3
Q4
J1 P2 - U1 GND
5V
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. 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, 10000uF 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, 220pF, 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
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    15.6k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M

ESP32 waterpump interface

ESP32 waterpump interface thumbnail
Welcome to your new project. Imagine what you can build here.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Digi-Key

$2.51–$3.00

LCSC

$7.59

Mouser

$0.50

Assets

No assets added.

Controls