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  1. Sadlercomfort

    12VDC Fan - 4 Pin

    Simple question.. Is it okay to assume I can connect the PWM pin of my fan directly to the 5V PWM output of my microcontroller? Maybe with a 100Ω resistor and a 5V Z diode? https://www.arctic.ac/uk_en/downloads/dl/file/id/2233/f14_pwm_spec_sheet_english.pdf
  2. Sadlercomfort

    Choosing the right NTC

    Hi Guys, I have a 12VDC fan hooked up to a Pwm module, which is controlled using an NTC. Shown in this link: https://www.ebay.co.uk/p/12v-PWM-PC-CPU-Fan-Temperature-Control-Speed-Controller-Module-High-temp-Alarm/835782064?iid=302358014128 After adjusting the trim pots the Dc fan stays off...
  3. Sadlercomfort

    Need help storing keypad input - Hi-Tech C

    Hi Guys, I'm trying to write a program which will record the pressed keys on the keypad, after the person hits enter from an external standard push button. As the user presses buttons, the numbers get written on an LCD display one by one. This works nicely, but I now need to record all the...
  4. Sadlercomfort

    Multiple interrupt functions but one interrupt vector

    Hi Guys, I'm using a PIC16F877 40-Pin, MPLAB and Hi-Tech C compiler. I'm trying to use both an RB0/INT interrupt and PORTB (RB7:RB4) interrupt but keep getting the error: multiple interrupt functions (_INT_ISR and _ISR) defined for device with only one interrupt vector Here's the two...
  5. Sadlercomfort

    Looking for PCB design information

    Hi guys, I'm looking for some articles or reliable resources which explain how to design a professional PCB and good practices. I need to research these for my project, so they need to be reliable but can't find anything.. there's a few books online but I can't buy them. I've already...
  6. Sadlercomfort

    Rotary Switch

    Hi Guys, I'm looking for a Rotary Switch on F@rnell to use for a project.. I've never used one before so the terminology is confusing me slightly. I understand the concept, but dont understand things like n.o of poles, switch positions and angle of throw. I need one that clicks in aswell...
  7. Sadlercomfort

    Laminator for PCB's ?

    Hi Guys, I need a laminator so i can transfer dry film to a copper clad PCB. How do I know the laminator can fit the PCB? Most laminators say the maximum pouch size is 250Microns (0.25mm). But I need one that can fit a 1.5mm PCB Any recommendations? Thanks, Ash
  8. Sadlercomfort

    Music Keyboard - Increase Sustain/Decay Time

    Hi All, I have a 64 key electronic piano and as you play a note the note stops playing the instant you release your finger. This doesn't sound right at all, I have a sustain pedal which I can set to NC but this puts too much sustain on the notes and they being to blur together. o_O Adding...
  9. Sadlercomfort

    DesignSpark - Etching Test File

    Hi All, Does anyone have a test board design, which can be used to test the accuracy of the etching process for diy pcbs? Something like this: Thanks, Ash
  10. Sadlercomfort

    µC - Temperature Sensor DS18B20

    Hi all, I'm really stuck trying to get my code to work and read temperature from the DS18B20. After I've parsed the temperature reading I seem to get 0b01111111 in whole degress C. I used this website to help me: https://www.maximintegrated.com/en/app-notes/index.mvp/id/2420 #include...
  11. Sadlercomfort

    Reading Temp from DS18B20

    Does anyone have some example code to read temperature from a DS18B20 or similiar device, in Hi Tech C?
  12. Sadlercomfort

    Converting int to string - C Programming

    Hi Guys, How can I convert an int to a string using C programming Hi-Tech Compiler? I am using an ADC pin on a pic to measure a voltage, but need to convert the value measured to a string before I can display it on an LCD.
  13. Sadlercomfort

    Flow Chart Software? C Programming

    Can anyone recommend some good software for creating flow charts? Would be nice if there's one suited to C programming.
  14. Sadlercomfort

    16x2 LCD 4-bit mode.. RW pin

    Hi Guys, Do i need to ground the RW pin when using 4-bit mode, or can I still use the RW pin to read data from the LCD.
  15. Sadlercomfort

    Oscilloscope Help

    Hi Guys, I'm trying to measure a small signal change when i connect a 9v battery to a remote while nothing is pressed, to see how the remote discharges the battery when sitting. I cant seem to get a good signal on my oscillate and there seems to be a lot of noise. Any ideas? See a pic...
  16. Sadlercomfort

    Testing A TVS Diode

    Hi Guys, Is it appropriate to test a TVS diode using a diode check, and simply testing both ways. I have a smbj33 TVS Diode which is used between the +/- of a motor in a H-Bridge Circuit. I'm getting 0.121V and 0.194V each way. :cool: Thanks, Ash
  17. Sadlercomfort

    Help Programming 16x2 LCD - PIC16F73

    Hi Guys, I'm having trouble programming an 16x2 LCD, I wondered if someone could check my code. It compiles ok. Still don't fully understand how to program this LCD, the order of which to execute commands seems confusing. What is the sequence of writing data to the LCD, for example selecting...
  18. Sadlercomfort

    Problems Programming PICKIT 2 Clone

    Hi Guys, I've made a pickit 2 clone but i cant seem to program a PIC16F73 with it. I've checked my circuit and measured different point with the volt meter and everything is reading as expected. I figured that the MPAB is incompatible with the PIC16F73 so I'm using the standalone PICKIT 2...
  19. Sadlercomfort

    Buying soldering iron

    Hi Guys, I'm looking to buy a new soldering iron, nothing to expensive around £40 or £50 Does anyone know what material the tips should be made of? When I last Brought a cheap soldering iron the tips were poor quality. I found this one on ebay which looks quite good...
  20. Sadlercomfort

    ESD Protection - Design Consideratons

    Hi guys, I've found some of the following information very useful for those interested in design. ESD is quickly becoming an important aspect of hardware design, as integrated devices are manufactured smaller and are increasingly sensitive to static discharge. The article is easily read and...
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