![]() ![]() Moving the 10k resistor pullup to pin 1 may solve the problem outright.Īnother thing to check is whether to are actually getting 5V out of the 5V pin on the FTDI adapter. This will have no effect, and means that the /RESET recovery will be only due to the in-built pullup, which is purportedly a higher value like 30 to 60k, and will thus take 3 to 6 times as long to reset, and will be more susceptible to noise. However, on the breadboard in the photo, the 10k resistor is connected to the wrong end of the cap, attaching to DTR. This will force /RESET to become deasserted some brief time after being asserted by DTR going low. ![]() The actual Arduino (eg: Deumilanove) schematic shows a 10k pullup resistor from pin 1 to +5V. I think the Reset circuit is supposed to mimic the one in an actual Arduino, which has DTR connected via a 100nF (0.1uF) capacitor to /RESET (pin 1). There is almost certainly an error which will cause Reset not to work as expected. Looking at the picture you appear to be following here: In the Arduino IDE I have the 'Arduino Uno' selected. Like Gwideman correctly stipulates, the resistor needs to go to pin 1, and not to the DTR-side of the cap. Only the pull-up resistor of the RESET is falsely connected in that picture. I used a FTDI basic to program it, almost exactly just like the picture in the link of Gwideman gave above. My problem was immediately solved, and the happiness returned. Luckily I had a chip socket mount (IC Socket 28 Pin DIP) which I placed between ATmega chip and breadboard. I bought the breadboard in the Netherlands, so I can't say if it is Chinese or not, but apparently it also has some deep connectors and difficulty connecting with the pins of DIP chips. While uploading some pins were flashing, even the LED I hooked up to the pin 19 (pin 13 on Arduino board). But when I tried loading a program, I got the avrdude message. It really seemed like it was in properly, not loose, couldn't go any deeper, wouldn't fall out when you shake it upside down etc. However, when I initially placed the ATmega chip on the breadboard directly, it made a 'click' sound. What eventually turned out to be the issue was that the ATmega328 chip was not properly 'clicked' in the breadboard. I solved my situation, and would like to share it so maybe it will help others. I also came here because my standalone, bootloaded ATmega328 didn't want to load my program and gave that avrdude error. To popular demand here are pictures of my board and the USB to FTDI breakout board I am using. maybe that utlra bright white LED I had earlier was pulling to much current with a 270 ohm resitor. (I have a sketch on it that sends incrementing integers through serial every second)Īlso interestingly, (although I was still unable to send a sketch before this happened) any LED I plug on pin 13 (aka 19) is now much dimmer. DTR line calls a reset and I still get serial output. I still am not able to upload a sketch and get the same error. I've replaced my 1k pull-up resistor with a 10k one This isn't the suggested 47uF and 0.1uF but I guess it`ll help filter out none the less. OK I've added a 100uF electrolytic capacitor along with a 0.1uF one between 5v and GND. If you'd like any more info, let me know, I'll get it for you. why is that? Could that explain my problem? But, the little tiny LEDs on the breakout board labeled TX and RX are not always on. I know this because if I connect a LED in parallel with the lines, they light up. It can.īoth the TX and RX lines are always at 5 V. Now, I've tested to see if the ATmega328 can send serial info through the breakout board to by computer. The DTR pin out of the FTDI board is successfully resetting the ATmega328 for sure as it goes through its magical blinking sequence when I try to upload something. Switch RX and TX (never know?) still nothing so switched back to initial TX - RX configuration. Result: Flawless! the program boots and everyone is happy.īack to the FTDI breakout board. In doing so I am using the ATmega16U2 on board to send the program. ![]() When I try uploading a sketch, I get this bad boy :Īvrdude: stk500_getsync(): not in sync: resp=0x00Ĭonnecting the header pins of the Arduino "shield" to the chip on the breadboard. I bought a "FTDI Basic Program Downloader USB to TTL FT232 for Arduino ACC" off ebayĬonnect the DTR pin to pin 1 on the ATmega through the 0.1uF capacitor.Ĭonnect the RX pin to pin 3 on the ATmega (TX)Ĭonnect the TX pin to pin 2 on the ATmega (RX)Ĭonnect the 5V pin to the 5V rail of the board to supply the board with power from the USB interface.Ĭonnect the GND pin to the GND rail of the board I am using a USB to TTL-serial breakout board based on an FTDI chip. I would like your advice relating to using the Arduino IDE and avrdude to program an ATmega328 which is preloaded with an Arduino bootloader. ![]()
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