Propeller Fundamentals Labs - hardware question
RobertW
Posts: 66
Hello,
I am working through the Propeller Fundamental Labs book and am coming up on the chapter that deals with using the counter modules.· Although I have the Parallax Development board, there are a few part that I do not have for the labs and was planning on picking up some of these items at a local Radio Shack store.· When I went there tonight with my 'shopping list', I was not sure exactly what type of·capacitors and resistors·I needed.· For the RC decay labs it calls for a 0.01uF capacitor.· I saw there were electrolytic, metal film, tantalum, etc.· Which one should I be using? For the infrared LED labs, there is a resistor connected to the infrared LED.· In addition to this lab,·some of the other labs require·1k Ohm, 10k Ohm, and 100 Ohm resistors.··After seeing it in the store,·I remembered there are different·Wattages for resistors.· For infrared LEDs, standard·LEDs, and the EEPROM for the Propeller,·what·Wattage should I be using?· For either·of these components, if possible, I am looking for something fairly·inexpensive and general purpose which I could use for other beginner type projects.· It could be that for these type of labs, some of the component types do not matter as much as they would for other applications.· I don't have enough electronics experience to know.
Also, I have read other places that sometimes·it is·recommended to have current limiting resistors between microprocessor pins·and input or·output components.··Is this also recommended for·the Propeller chip?· If yes, what is recommended?
Thank you,
-Rob W.
I am working through the Propeller Fundamental Labs book and am coming up on the chapter that deals with using the counter modules.· Although I have the Parallax Development board, there are a few part that I do not have for the labs and was planning on picking up some of these items at a local Radio Shack store.· When I went there tonight with my 'shopping list', I was not sure exactly what type of·capacitors and resistors·I needed.· For the RC decay labs it calls for a 0.01uF capacitor.· I saw there were electrolytic, metal film, tantalum, etc.· Which one should I be using? For the infrared LED labs, there is a resistor connected to the infrared LED.· In addition to this lab,·some of the other labs require·1k Ohm, 10k Ohm, and 100 Ohm resistors.··After seeing it in the store,·I remembered there are different·Wattages for resistors.· For infrared LEDs, standard·LEDs, and the EEPROM for the Propeller,·what·Wattage should I be using?· For either·of these components, if possible, I am looking for something fairly·inexpensive and general purpose which I could use for other beginner type projects.· It could be that for these type of labs, some of the component types do not matter as much as they would for other applications.· I don't have enough electronics experience to know.
Also, I have read other places that sometimes·it is·recommended to have current limiting resistors between microprocessor pins·and input or·output components.··Is this also recommended for·the Propeller chip?· If yes, what is recommended?
Thank you,
-Rob W.
Comments
1/4 W resistors will be fine.
I wouldn't bother with current limiting resistors on the pins. 150R should be OK if you want to use them, giving a max. current of 22 mA,
Leon
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Post Edited (Leon) : 9/27/2009 12:34:32 PM GMT
-Rob W.