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  1. B

    Little solar powered battery and led.

    You can get some idea from here.
  2. B

    LED Aquarium light fixture

    You can make an App controlled RGB+UV LED Aquarium Light by yourself. This is based on ESP12E. You can find the code and other docs here: https://www.pcbway.com/project/shareproject/App_controlled_RGB_UV_LED_Aquarium_Light_c67dcb7e.html
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    Wireless momentary switch

    I think you can make yourself something like this: https://www.pcbway.com/project/shareproject/433MHz_4_Channels_Wireless_Switcher_Circuit_f4e91277.html It is a full-featured four channels wireless switcher device that can be paired with the majority of 433MHz or 315MHz wireless remotes in the...
  4. B

    freezer detection

    I think you need to install a PIR sensor inside the freezer.
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    Motorized roof-mounted clothes drying rack

    I found this 'drying rack motor' : https://lunyee.en.made-in-china.com/product/NFZGiSpulgYy/China-49mm-15rpm-180rpm-Fully-Automatic-Clothes-Drying-Rack-Motor.html
  6. B

    Flashing LED board quit working

    Check with a multimeter. Find out if there is a broken trace somewhere.
  7. B

    Lighting for street sign

    What about switching two loads with an Arduino and a relay?
  8. B

    Slow down AC fan speed

    What about this type of fan controller? https://www.pcbway.com/project/shareproject/IoT_Enabled_Smart_Fan_Speed_Controller_5a61a91d.html Will this work?
  9. B

    Slow down AC fan speed

    Instead of modifying the motor circuit, you can use a PWM controller.
  10. B

    Capacitor type in low pass filter

    Here are some suggestions too: https://www.quora.com/Which-type-of-capacitor-is-used-in-a-low-pass-filter
  11. B

    Opamp Filter circuit

    You can post this here: https://community.arm.com/f
  12. B

    What type of engine do I have

    1)Controlling the voltage supplied to an AC brushed motor can affect its speed and torque. However, you need to be careful when doing this, as reducing the voltage too much may lead to the motor not having enough power to function properly or stall under load. On the other hand, increasing the...
  13. B

    Inductance circuit

    May I know the name of the simulation software that you used here? Please?
  14. B

    Current Flow

    I can see that you've already got your answer. For more details about how transistors work, you can see here:
  15. B

    120V AC inverter with 40V battery

    I think using a DC-DC converter will be easy.
  16. B

    Animal research project - Load cell switch when reaching a variable threshold

    Here is a similar type of project for Robot foot pressure sensing: You may need to modify it for animals.
  17. B

    NOR flash programming

    You can also post this to the ARM community: https://community.arm.com/f
  18. B

    Marvel Under Counter Ice Machine

    I think testing the ICs first will be helpful....
  19. B

    Frequency Signal Generator for Bluetooth Speaker

    As far as I know there is no such ready-made frequency generator. However, it is possible to add bluetooth connectivity to a signal generator : https://www.hackster.io/electroboy001/making-a-20khz-signal-generator-using-bluetooth-40ccba
  20. B

    PIR hc sr501 sensitivity

    CW=increase, CCW=decrease Ref: https://lastminuteengineers.com/pir-sensor-arduino-tutorial/
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