Posts made by JeffZhou

Hi, I‘m onion Jeff. usually, our specifications will give some guidelines for reflow soldering， and about your manufacturing guidance, as it based on you product，it is hard for us to issue guidance.

1. About the wash cycle , .
   Our module is the same with the wifi module or BT module on the market. you just need to be careful that the silk screen on the label is erased by the no-clean flux .
2. Is there a recommended stencil thickness?
   Our module Spec had the module's thickness parameter
   
3. Tape and Reel are 56mm wide.
   Sorry for the mistake, the real of the actual tape and reel is 44mm, we will change it soon and update the packaging parameter.

Hi，1. you can add a pull-up resistor to the Omega2S HW_RST pin and add a pull-down resistor to the SW_RST pin. 2.the current supply of VCC need at least 500mA.

Hi,it seems that the schematic is ok. You can check that if the SMT issue or you can check the SDCD PIN Voltage when the sd card insert .

Hi, if you don't need to use Micro SD Card .

1. As Onion Firmware's SD Card funtion will be actived when SD_CD PIN at High-level.When you keep using Onion Firmware,you can use pulldown resistor to set the SD_CD PIN to low-level.
2. You can set each SD Card PIN to GPIO Mode.

Hi，Omega2S+ need to add an extend wifi antenna.you can use ipex connector to connect an extend wifi antenn or use the ANT PIN to connect a pcb wifi antenn.

@adamc You can download the latest Firmware at this URL：http://repo.onioniot.com/omega2/images/

@adamc
Hi, here i also use a omega2 B160 Version Firmware，and it can work well.So maybe there are something broken of your Firmware package. You can retry the "oupgrade" CMD or download the lastest Firmware and using "sysupgrade" CMD to update the firmware.

@crispyoz Hi, Yes ,here i also test the output mode ,if we set GPIO16 & GPIO17 to output mode , every thing can go well ,just like your test above. I had tested Omega2 and Omega2S ,both of them have the same issue when gpio16 or gpio17 set to input mode.

and as the screenshot that @Moonshiner replay, his GPIO17 was set to output mode when GPIO16 was set input mode ,so when the GPIO17's level change ,it will affect the GPIO16's level.

@Moonshiner Hi，As i recurrent the issue , i found that there is a MT7688 IC bug. between the GPIO16 and GPIO17 ,there has a connected resistance inside the IC, so when GPIO16 and GPIO17 set to input mode ,one of the gpio level change will affect the other one gpio pin.

1. when GPIO16 and GPIO17 set to input mode ,you can use a multimeter to test the resistance between the two pin. here i had test two Omega2+ module ,the resistance is about 40K Ω.
2. when GPIO16 or GPIO17 set to input mode ,and another GPIO set to output mode ,and the input mode GPIO level state also will be affect by the output mode GPIO.
3. how to solve this issue.
   For the GPIO(16 or 17) that we need to set to input mode ,we can add a pull-down resistor(10K or 4.7K). I had tested that when add a 10K pull-down resistor on the GPIO16 PIN ,when the GPIO17 has a 3.3v high-level,there is a 1,04v low-level of the GPIO16 PIN. if we need tht GPIO16 has lower level, we can use a 4.7K pull-down resistor.

@Malcon4 here is the ethernet port that Omega2 using .

@Malcon4 Please check out the new Omega2S hardware design guide, there's a section on ethernet design!
https://github.com/OnionIoT/Omega2/blob/master/Documents/Omega2S Hardware Design Guide.pdf

Great ！

expansion header is 2.54MM~

@FredyAlvarez Hi ,you can use 115200 Bauds. and if the Omega2 runs ok, the serial log will show something.

@akif-durmaz Hi ，what i mean is you can try to use another ethernet connector.

@akif-durmaz
Hi, i had checked the Normal ethernet connector（RJ45），it seems that the inside schematic isn't as the same as yours. Here the connector's sch has the same channel coil of RX/TX.SPEC of HR913550A

@akif-durmaz Hi ,please add a screenshot of the ethernet connector and transformer 's schematic.

The lastest Omega2S reference schematic had deleted the R401~R406，C403 and C404.