Pull-up (and pull-down) revisited

Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)
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Re: Pull-up (and pull-down) revisited

By Glitch69
- Tue Mar 22, 2016 7:20 am #43782 Just a note to i2c and pull up -- some module works fine without pull up resistors, some does not... i cant not figure out the reason behind, just realized, that this fact...
I have 8 esp12 with am2321 and bmp180 without external resistors, working fine, without any issues.
Now I have a package of 10 of esp12f from banggood, and can not flash to nodemcu - there is no communication with PC..
any suggestion?
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Re: Pull-up (and pull-down) revisited

By eriksl
- Tue Mar 22, 2016 7:54 am #43787 Anyway to summarise the topic: it may (!) very well pay off to add small capacitors to some pins, to suppress RF components, especially if you're experiencing wlan connection (speed) issues. At least it's worth a try.
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