Search found 33 matches

by johnlee
Mon Jun 18, 2018 2:25 pm
Forum: Hardware
Topic: TX Power Consumption with Impedance Mismatch
Replies: 4
Views: 247

Re: TX Power Consumption with Impedance Mismatch

yes. it could happen depending on what the impedance is at that point. the transceiver is not designed to work under such conditions. Imagine the power amplifier trying to pump 20 dBm of power into a low impedance, and since power is current^2 x R, and R is very small, the current would have to incr...
by johnlee
Mon Jan 01, 2018 7:33 am
Forum: General Discussion
Topic: Antenna and reachability
Replies: 1
Views: 254

Re: Antenna and reachability

antennas are a huge part of it. you have to consider the following factors: 1. are you putting the module in the right way? e.g. if there is a ground plane covering the module's antenna, it will not only short out the signals, but also cause distortion, possibly making most of the signal indeciphera...
by johnlee
Thu Dec 21, 2017 3:43 am
Forum: General Discussion
Topic: Newbie questions
Replies: 1
Views: 239

Re: Newbie questions

could try running it and see what pops up. but how about just reinstalling the image to whatever that you want.

"Life is about the journey and not the destination."
by johnlee
Sun Sep 24, 2017 1:36 pm
Forum: General Discussion
Topic: Buying ESP parts
Replies: 6
Views: 1244

Re: Buying ESP parts

thank you my friend!
by johnlee
Sat Sep 23, 2017 11:36 am
Forum: General Discussion
Topic: Buying ESP parts
Replies: 6
Views: 1244

Re: Buying ESP parts

yes. I am John Lee from Espressif. On the record, Schoeta is wholly owned by Espressif.
by johnlee
Thu Sep 21, 2017 8:24 pm
Forum: General Discussion
Topic: ESP32 Specifications (WiFi Receive)
Replies: 1
Views: 2517

ESP32 Specifications (WiFi Receive)

Introduction This is a series of articles about ESP32 WiFi specifications. The organization of the topics presents the most important concepts first and the least important and most obscure ones, the last, so that the reader can stop at anytime when it becomes irrelevant. For a start, we will discu...
by johnlee
Sat May 27, 2017 1:26 pm
Forum: General Discussion
Topic: Txs
Replies: 3
Views: 1718

Re: Txs

hey Rudi, let me look into this and get back ASAP!
by johnlee
Sun Dec 18, 2016 4:13 pm
Forum: General Discussion
Topic: ESP32 ADC precision
Replies: 1
Views: 1309

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: 2454

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: 7324

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.