I am very new to embedded electronics for the most part..
I have an Arduino Duemilanove (2009?) dev board..
but followed some links and tuts to make an Arduino compatible circuit...
here is parts tut I followed:http://www.instructables.com/id/Perfboard-Hackduino-Arduino-compatible-circuit/
• 28-pin DIP IC Socket - $0.30 - buy mouser
• 16MHz crystal - $0.55 - buy mouser
• momentary push-button switch - $0.15 - buy mouser
• 1k ohm resistor - $0.05 - buy mouser
• LM7805 5v voltage regulator - $0.35 - buy mouser
• 2 x 22pF capacitors - $0.12 - buy mouser
• 10nF capacitor (ceramic disc code '103') - $0.10 - buy mouser
• 22uF capacitor - $0.02 - buy mouser
• ATMega168 or 328
Mouser parts/BOM list:https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=20ea42b1c5
I did make my own "FTDI cable" using an older phone data cable.. and the tuts on the net as well.. (tried to make a parallel and a MAX232 version...none worked)..
flashed my chips using my real Arduino.. using the hacked data cable to upload my sketches from computer/IDE to breadboard circuit.
this all seemed to work fine..
until I decided to re-create the breadboard circuit on a smaller breadboard from Radioshack..
copied circuit.. ..
I hooked up my PSU.. gave it around 7.2 volts.. as what I would normally use in my projects..
and it wouldnt fire/run the blink sketch?
I go back to my original breadboard..same results!..
after some tinkering..
I found that if I dialed down my PSU to about 4-5v.. it started working?
I am completely stumped and need help figuring out WHY? Im not much of a hardware guy.. just following along.. (really just like to play with the code sided of things)
here is my circuit/breadboard.. I do 'not' think its my circuit..as once the PSU is dialed down... it starts working?
I grabbed my (cheapie) meter and tested the output after the vRegulator.. on the rails of the project.. its was around 5v or so..
I have no direction..sorry if this is newbie territory, but I have never encountered it..nor have any idea WHY this would be a problem?
I can only think its the vRegulator somehow? but thought I could throw like 12-25v at it or something?
Im hoping/thinking.... the circuit and everything is really' fine.. its somehow tied to how I have the LED on the breadboard..that is giving false indication?
after a few more tests.. I can see now that when I adjust the voltage on my PSU as the circuit is running..it affect the leds powering on/off..
not sure how I go about fixing this? resistor the LED? (would this have to be a fixed resistor then to always prepare for a certain/static voltage?)
I crank down to 4.3 volts.. and the led blinks normally...red led).. Im surprised the Arduino runs at that? after the vRegulator?
Thanks for any feedback.. (please dumb it down.. so I can understand it!) haha..