Search found 26 matches

by johnlee
Sun Dec 18, 2016 4:13 pm
Forum: General Discussion
Topic: ESP32 ADC precision
Replies: 1
Views: 561

Re: ESP32 ADC precision

the ADC is 12-bit. but it could be affected by:
1. ground bounce due to power amplifier,
2. missing decoupling capacitors, and
3. insufficient settling time.
by johnlee
Fri Oct 14, 2016 2:06 pm
Forum: General Discussion
Topic: Can the Bluetooth radio be used to TX/RX raw non-BT radio packets (as nRF24 replacement)?
Replies: 3
Views: 890

Re: Can the Bluetooth radio be used to TX/RX raw non-BT radio packets (as nRF24 replacement)?

In terms of power consumption if you are using ESP-NOW and backing off in terms of power, i.e. transmit 0dBm, i think you would get similar performance as Bluetooth. Although, the transmission occupies a large bandwidth, but the transmission time is much shorter. It might be good enough. In short, y...
by johnlee
Sun Aug 21, 2016 8:25 am
Forum: General Discussion
Topic: Here We Go: Release 1st Sept.
Replies: 22
Views: 3474

Re: Here We Go: Release 1st Sept.

about the supply voltage range. the main issue is not with ESP32, but with the flash chips which usually runs off 3.3V, with the exception of some vendors which went as low as 2.2V. with ESP32, we decided to try using 1.8V flash; hence we can now go to 2.0V.
by johnlee
Mon Feb 15, 2016 1:33 pm
Forum: General Discussion
Topic: ADC internal/external reference
Replies: 2
Views: 1246

Re: ADC internal/external reference

nope. only internal reference. The DAC is reference to same voltage as the ADC.
by johnlee
Sat Feb 13, 2016 1:21 pm
Forum: General Discussion
Topic: Why does my ESP31B beta board not work at low temperature?
Replies: 0
Views: 1061

Why does my ESP31B beta board not work at low temperature?

The reason for this is a design change in ESP31B in the crystal oscillator to radically reduce the power consumption (during sleep), and add more tuning range to the crystal oscillator. This resulted in the crystal being sensitive to the type and brand of crystal used and somehow even the design of ...
by johnlee
Sat Dec 26, 2015 10:35 am
Forum: General Discussion
Topic: ROM functions
Replies: 3
Views: 1380

Re: ROM functions

yes, the ROM is very rudimentary; we are in the process of defining the ROM now, including SSL functions, and especially those functions related to security.
by johnlee
Sat Dec 26, 2015 10:33 am
Forum: General Discussion
Topic: Newsletter for Manufacturer, Developer and Partners
Replies: 2
Views: 10880

Re: Newsletter for Manufacturer, Developer and Partners

yes, i think this is a splendid idea. Will get management to look into this.
by johnlee
Sat Dec 26, 2015 10:08 am
Forum: General Discussion
Topic: Little Boy crying under Christmas tree
Replies: 7
Views: 2562

Re: Little Boy crying under Christmas tree

sorry guys, we ran out of boards and chips. there is another batch coming. but this one will take a while.
by johnlee
Sat Dec 26, 2015 10:06 am
Forum: General Discussion
Topic: jump to run addr @ 0x40000
Replies: 10
Views: 2968

Re: jump to run addr @ 0x40000

103mA doesn't seem the kind of number that we are expecting during boot. we need to check on this...
by johnlee
Tue Dec 08, 2015 3:08 am
Forum: General Discussion
Topic: Physical format for beta units
Replies: 6
Views: 2966

Re: Physical format for beta units

the pin outs are now available at
http://www.pighixxx.com/test/portfolio- ... olioID=360

Thanks to Pighixxx!