I'm trying to get a HiLetgo FT232RL FTDI Mini USB to TTL Serial Converter Adapter Module to down load to an arduino pro micro. If I start to download while it's compiling if I press the rest button it downloads but when I hook the rest pin up to DTR or RTS it wont upload. I put the usb unit on a scope and the RTS should be high then pulse low to rest the arduino. But it stays low meaning the arduino is continually resetting and wont download. Any suggestions to solve this?
I have no issues with an FT232RL. So it would be best to post your connections.
It's not quite clear what you exactly did. But that is less relevant for this reply.
A Pro Micro does not use the RX and TX pins for upload; it uses its builtin USB.
Notes:
- To reset a Pro Micro from software, you will have to open and close the serial port (USB port of the Pro Micro) with a baud rate of 1200 baud.
- RX and TX are Serial1 in sketches that you write for the 32U4.
The micro arduino I have does not have the built in USB. I have the TX of the FT232RL going to the RX of the Micro. The RX of the FT going to the TX of the micro. Vcc and ground interconnected and the RTS to the reset pin of the Micro
Than it is not a Micro.
Please try to be consistent in the naming. When you talk about a Pro Micro, people think that you're talking about (a clone of) the SparkFun Pro Micro (https://www.sparkfun.com/products/12640).
So which board do you have? I clearly see a USB connector
As you can see, this is a PRO MINI. That's a big difference and a completely other board than a pro micro. The PRO MINI is more or less a classic nano without an USB-serial converter ( and with different pinout ).
You must not connect the DTR pin to RESET directly but via an 100nF capacitor.
Most of the MINI clones I know have a DTR pin, which is connected to RST via this capacitor and can directly be connected to the DTR of the USB-serial converter.
It is the pin marked "GRN" in the picture @igor61 shared:
The "GRN" pin is so marked because, on the FTDI cables that were commonly used when the Pro Mini first came out, the DTR or RTS pin was a green wire.
The way i would upload to that using an uploader (other than the UNO i actually use for it now) is hold the reset button down until the IDE shows the compile results (after hitting the upload button) and then release it.
This works and solved my problem. Much thanks!
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