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)
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Chip output impedance = 39 + j6 Ω. It is suggested to retain the π-type matching network to match the antenna.
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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 NumberESP8285H16
Y1- Crystal_SMD - Part Number FTX26.000M6SM3S-10/10BFC
C2- 5.6pF RF Capacitor, JOHANSON TECHNOLOGY500R07S5R6BV4T
- GerberFiles.zip
Statistics: Posted by yakshatantra — Fri Apr 30, 2021 2:09 am
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