Not able to scan router/mobile access point from ESP8285H16

yakshatantra
Posts: 1
Joined: Sat Apr 24, 2021 8:43 pm

Not able to scan router/mobile access point from ESP8285H16

Postby yakshatantra » Fri Apr 30, 2021 2:09 am

Hi,

We are working on a PCB board based on SOC ESP8285 and have created PCB prototypes for testing WIFI connectivity.

But after loading our code for WIFI scanning we are not able to get any access points, even after mobile hotspot kept very close to pcb, except below scenarios-

1. When we start WIFI hotspot on one PCB(using arduino sketch SoftAP.ino in attached zip file) we can view the same access point when we scan from another PCB, and also are able to connect. WIFI strength is also HIGH.
**Please note the access point is not visible on other devices like mobile.

2. When we scan we can detect WIFI Direct Access point but not the access point exposed by our router, also not able to detect hotspot started by mobile phone, we have tested with Android and Iphone.

We are using PI impedance matching for below specification defined in datasheet(Please check schematic)
"
Chip output impedance = 39 + j6 Ω. It is suggested to retain the π-type matching network to match the antenna.
"

Our pcb dimensions are 35mm x 25mm x1.6mm, FR4 material. Please find attached Schematic and PCB layout.

We are using below components for antena and crystal matching

U1 - ESP8285 - Part Number ESP8285H16
Y1 - Crystal_SMD - Part Number FTX26.000M6SM3S-10/10BFC
C2 - 5.6pF RF Capacitor, JOHANSON TECHNOLOGY 500R07S5R6BV4T
Attachments
ESP8285_Schematic.jpg
GerberFiles.zip
(30.28 KiB) Downloaded 205 times

Her Mary
Posts: 504
Joined: Mon Oct 27, 2014 11:09 am

Re: Not able to scan router/mobile access point from ESP8285H16

Postby Her Mary » Fri May 07, 2021 11:35 am

Not sure if it's a hardware issue or a software issue. Maybe you can send your hardware design and software source code to Espressif technical support, and ask for a help. https://www.espressif.com/en/contact-us ... -inquiries

milesstone
Posts: 12
Joined: Mon Apr 26, 2021 4:50 pm

Re: Not able to scan router/mobile access point from ESP8285H16

Postby milesstone » Tue May 18, 2021 11:02 pm

Have you tried connecting to it with another device such as afmwhatsapp smart phone? If it's just one device having an issue, then you know it's a problem with that device.

ethel33
Posts: 1
Joined: Fri May 21, 2021 7:37 pm

Re: Not able to scan router/mobile access point from ESP8285H16

Postby ethel33 » Fri May 21, 2021 7:47 pm

milesstone wrote:Have you tried connecting to it with another device such as afmwhatsapp smart phone? If it's just one device having an issue, then you know it's a problem with that device.

I have just tried, it's not a problem with the device.

Nielson
Posts: 10
Joined: Wed Dec 09, 2020 4:15 pm

Re: Not able to scan router/mobile access point from ESP8285H16

Postby Nielson » Wed May 26, 2021 10:05 pm

milesstone wrote:Have you tried connecting to it with another device such as afmwhatsapp smart phone? If it's just one device having an issue, then you know it's a problem with that device.

I am satisfied with your statement and it may happen
There is a problem with the device they are using

Because it happened to me too and when I changed my device my problem was solved

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