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ftdi friend
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Please be positive and constructive with your questions and comments.

ftdi friend

by herman75156 on Fri Mar 18, 2016 7:16 am

exactly how do you jumper the ftdi friend to get output voltage of 3.3 volts?

what do I cut? what do i solder?

herman

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Re: ftdi friend

by adafruit_support_bill on Fri Mar 18, 2016 8:19 am

There are labeled jumpers to control both VCC and Logic Levels on the back of the board.
To change to 3.3v, cut the small trace between the +5v pads and put a blob of solder across the +3v pads.
Image

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Re: ftdi friend

by dhalbert on Fri Mar 18, 2016 10:06 am

Note that if you are using the FTDI Friend to power/program an ESP8266 HUZZAH, the pre-wired power and data jumpering is correct. If you set VCC to 3.3V, that will be too low for reliable operation of the ESP8266, because the HUZZAH has an inline diode and regulator that will drop the 3.3V input to around 3V or less. A few people have reported flaky HUZZAH operation that was traced to supplying 3.3V VCC.

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Re: ftdi friend

by herman75156 on Fri Mar 18, 2016 6:11 pm

So cutting the left trace only lowers vcc 5 v to CMOS 3.3v ? Only effecting power out?

Shorting the right side open trace or pad will only effect logic signal out?
5v open, 3.3v closed?

Because I use at times different logic levels I intend to put a switch on only the right side logic, open or close circuit. I do not use power out from
the ftdi friend.

Am I correct that the left side 5v is
Not relevant to the logic right side ?
Each is independent. The left 5v only
Effects power out, 5v closed, 3.3v open? The right trace only effects logic level, 5v open, 3.3v closed?

Thank you for your attention
herman
I

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Re: ftdi friend

by adafruit_support_bill on Fri Mar 18, 2016 6:34 pm

So cutting the left trace only lowers vcc 5 v to CMOS 3.3v ? Only effecting power out?

You have to solder the right trace too.
Am I correct that the left side 5v is
Not relevant to the logic right side ?

No. You need to connect one side or the other.

Because I use at times different logic levels I intend to put a switch on only the right side logic, open or close circuit. I do not use power out from
the ftdi friend.

You can use a switch. But one side or the other needs to be connected.

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Re: ftdi friend

by masterkenobi on Mon Aug 07, 2017 12:15 am

I am planning to reprogram my Sonoff using Adafruit FTDI Friend using this guide; http://randomnerdtutorials.com/reprogra ... eb-server/ . According to the guide, I must use 3.3V FTDI. However, I am confuse on how to set the jumpers at the back of the board. What is the voltage I should set for "VCC Out" and "Signal logic level"? Thanks.

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Re: ftdi friend

by adafruit_support_bill on Mon Aug 07, 2017 5:56 am

Both should be configured for 3.3v.

The signal level is 3.3v by default. To configure VCC for 3.3v, cut the small jumper on the 5v side and solder a bridge between the pads on the '3v' side.

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Re: ftdi friend

by masterkenobi on Mon Aug 07, 2017 6:00 am

Thanks!

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Please be positive and constructive with your questions and comments.