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KEDSUM CP2102 Module STC Download Cable USB 2.0 to TTL 6PIN Serial Converter For STC
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1.This is a USB 2.0 to TTL UART 6PIN CP2102 Module Serial Converter. Connect MCU easily to your computer!
2.Stable and reliable chipset CP2102
3.USB specification 2.0 compliant with full-speed 12Mbps.
4.Standard USB type A male and TTL 6pin connector. 6pins for 3.3V, RST, TXD, RXD, GND & 5V.
5.All handshaking and modem interface signals.
6.Baud rates: 300 bps to 1.5 Mbps.
7.Byte receive buffer; 640 byte transmit buffer.
8.Hardware or X-On/X-Off handshaking supported.
9.Event character support Line break transmission.
10.USB suspend states supported via SUSPEND pins.
11.Temperature Range: -40 to +85.
12.Supports Windows 98SE, 2000, XP, Vista, Window7, Mac OS 9, Mac OS X & Linux 2.40.
1 X CP2102 USB 2.0 to UART TTL 6PIN Module Serial Converter
1 X 5 PIN Cables
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On plugging this board on my Windows 8.1 desktop the drivers were NOT installed automatically, but windows gave me a download link for the driver installation files which I installed and then got the board working immediately. On Ubuntu 14.04 it just worked out of the box without having to install any drivers.
Next I used it to upload the basic blink sketch on a EMSL Diavolino board and Arduino Pro 8MHz 3.3v board (see photo), and both worked perfectly on the first try. So it seems that the converter board can tolerate 5v signal levels as well. The board auto-reset also worked without a problem.
Overall only one thing to complain about, the rx/tx activity leds are missing so it is hard to say if anything is going on during a transfer.
Pololu makes an even cheaper version of this board, but I bought this one since I wanted a USB A plug instead of micro USB.
I got this for two purposes. 1) So I could program ATMega328 chips on a breadboard without an Arduino. and 2) So an ATMega328 could send information to the Serial port of my computer (useful for debugging).
So far, I can get the chip to send messages to a computer but I cant upload new
Arduino Sketches. When attempting to upload, i get an error: "avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00".
Because, I expect to figure out the uploading problem, I am giving it 3 stars instead
For reference, the wiring for the ATMega328 is
TXD.............................RXD (pin 2)
RXD.............................TXD (pin 3)
DTR...."104" capacitor....Reset (pin 1)
Male header soldered into rts on usb breakout, to reset pin on pro mini
Rxi to tx
Txo to rx
Vcc to +5v
Cts is not used
Ground to any of the four grounds on the pro mini.
It's power led is as unpleasantly compact and bright as the pro minis so a dab of liquid electrical tape took care of that. You've got to load it with drivers but they're decently easy to find. There is a voltage controlling solderable bridge on the back side that may or may not actually matter but I soldered the center pad to the 5v pad.
Works like a charm though, you know, if charms worked.
For 3.3V applications, be sure to carefully cut the 5V line in the VCC output select. It's very small, and hard to see, but there is a tiny connection. I put a blob of solder on mine to put 3.3 V on VCC and was successfully able power and communicate with an MSP430G2552 running a hardware UART program. It's not a 5V tolerant chip. I checked the voltages. VCC and TX0 should be normally high at 3.3 V if the pin is soldered.
My only complaint is in the poor handmade build quality and lack of a proper jumper for the 5V/3.3V selection. But it's hard to beat this one for the price. You can't even get an FTDI FT232RL chip alone for the price of this, shipped.