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  1. (*steve*)

    12 v to 48 v boost converter for 48 v electric bike

    I feel the unbridled need to ask you if you like Wensleydale cheese.
  2. (*steve*)

    Pull up register

    I think you mean "pull up resistor" Depending on the nature of the output, the pull up resistor may so nothing. It could be a PWM or pull output with the voltage varying between 0V and 3.3V and a duty cycle such that the average value is 2.3V.
  3. (*steve*)

    Ball wall target board

    Have the three or four sensors trigger interrupts. This should allow you to get highly accurate timing. Beware that if your surface is non uniform, the propagation through it may not be linear. The grain in wood is one example. Assuming the surface is vertical, there may also be some non...
  4. (*steve*)

    Ball wall target board

    Yeah, I've seen the same technique used as a method of determining where you poke a screen (with sensors under the base of the monitor) For a really large board, you may also have to consider the time delay of the impulse reaching the sensors (effectively giving you two ways to locate the...
  5. (*steve*)

    Watering system

    Hey, great idea, a sponge on a wire connected to the lever of a microswitch. When there sponge gets wet, the switch closes. When it dries out enough, the switch turns back off Placing the sponge under a funnel, and shielded from the wind may be a reasonable solution. The length of the lever...
  6. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    The transistor and it's load form a voltage divider. To determine the voltage across the transistor you need to consider the voltage that would be dropped across the load. In this case the impedance of the transistor in cutoff will be vastly higher than the impedance of the load. That will...
  7. (*steve*)

    Watering system

    A slightly salty sponge with a couple of stainless steel probes stuck into it? I've not done this so it's conjecture.
  8. (*steve*)

    Light therapy device

    Excellent. I'll try to design you a board using fritzing. It has a very simple one-click board ordering option, and is also free software. Surface mount soldering is a skill, but for components that you'll be using here is not a difficult one to learn if you can already solder. The main...
  9. (*steve*)

    Brake light flasher (555 - based) circuit works on breadboard, but not PCB

    Plenty of people do it. It's "trendy". Possibly, but it could also be a software issue in fritzing. It would at least be useful to email them and enquire.
  10. (*steve*)

    Python

    Well, I'm currently part of a team using it to write a large multi-user system for data analysis.
  11. (*steve*)

    Watering system

    It seems that many of these rain sensors use material which expands when wet. This closes a switch. As it dries out and shrinks again the switch is turned off. As such, anything which shorts out the (presumably) 2 connectors when wet, and for some time thereafter should do the trick.
  12. (*steve*)

    Brake light flasher (555 - based) circuit works on breadboard, but not PCB

    I just installed fritzing. The layout appears correct.
  13. (*steve*)

    Apple iMac 21.5" A1418 820-3302A Blown Caps

    If you still have the capacitors and know where they went, measure their capacitance. Otherwise it will be really hard to determine the appropriate values. If you're lucky all of them are the same value, but since these capacitors are not marked... The photos are sufficiently blurry that...
  14. (*steve*)

    Brake light flasher (555 - based) circuit works on breadboard, but not PCB

    With the information you've given us, I think I can make out a break in the track. It might just be a trick of the light, but is the trace which goes along the area outlined as R1 broken? It might be worth looking at the circuit board layout and making sure the track didn't become broken in it.
  15. (*steve*)

    Light therapy device

    Hmmmm, how experienced are you with normal through-hole soldering are you?
  16. (*steve*)

    Where Do I Begin

    Taking code and circuit diagrams from the web is a good start. Try to understand how they work, make small modifications, and try to combine several different things.
  17. (*steve*)

    Im a noob diving into board level repairs.

    What sort of repair have you been doing, presumably board swaps?
  18. (*steve*)

    Analog Voltage recognition by Microcontroller ADC

    Also, please see post #2. There are some important unanswered questions.
  19. (*steve*)

    Analog Voltage recognition by Microcontroller ADC

    That will make the voltage inaccurate. Why is there any significant current? Does the output of the op amp exceed the supply rails of the microcontroller? Have you mistakenly set the pin as an output instead of an input?
  20. (*steve*)

    Python

    What is the engineer embedded in? Perhaps a shovel is a better tool. Jokes aside, I use python commercially. It's not going to run as fast as C, and imho a ducktyped interpreted language is not something you want to use for firmware. However, someone at my local hackerspace is using python...
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