Reading ARROW BOARD COMMUNICATION FAIL>

I connected with MAX485 module and tried to read but failed.

Possible1. RE DE pin not controlled and does only Driver Enable mode. ( sending mode.)

so not working .. and stops Arrowboard communication as well.

Possible2. too many 120 ohm cross resistor.  may three 120 ohm resistor on board. and controller. and my reading max485 module. so too many cross resistor.

Instead to read module. directly

using TX--> RX line check pull up so 5.0v and 

common the Ground with two module.

I can see TX led flashing so incomming data. and Osilloscope showoing 5v to 0v clean digital signal comming and beacon switch also working and can see through Osilloscope change pattern of signal clear but can not read by Arduino rx Sereal read.

I also change the baud rate from4800 to 19200 but still same not even broken word came up.

maybe PIC controller have total different setup to communicate.

found there are PIC microcontroller programmer called MPLAB X IDE

Mayneed to learn how to . but looks simullar old time of AVR programmer.

and price like this 

but in EASY EDA is almost of PIC controller is out of stock..

and looks need to install compiler and programmer. and may need to buy usb programmer to program this.

but problem is how to solder this smd chips....

price on alibaba .17 JULY 20

ESP TEST VOLTAGE INPUT 15.77v TO VIN 

IT works . WHEN CHECKING 3.3v regulator on Module 

looks working max 18V. 

ESP32 INSATALLING AND STARTING WIFI SCAN TEST

FIRST CONNECT ESP32 TO USB ON MACBOOK AIR(MY ONE)

RED POWER LED TURN ON

MENU ARDUINO --> REFERENCE -->

.https://dl.espressif.com/dl/package_esp32_index.json 

and OK button

AND GOTO

MENU TOOLS --> BOARD --> BOARD MANAGER AND SEARCH (ESP32)

THEN DOWNLOAD BOARD MANAGER.

THEN 

SELECT LIKE BELOW.

THEN MENU FILE -->

EXAMPLES--> WIFI --> WIFI SCAN OPEN

UPLOAD ...

IF FAIL, PRESS AND HOLD BOOT BUTTON ON ESP MODULE WHILE UPLOAD. 

..

TEST SCAN BELOW.

RJ9 4PIN TERMINAL IS NOW NOT COMMON.

RJ11 4PIN IS BETTER AND COMMON THESE DAYS.

RJ11 IS MORE WIDER 

RJ9 OR RJ22 /4PIN IS LINE PHONE CABLE. SMALLEST

 

testing A3144 sensor

Today I got A3144 hall sensor.

First I thought I might use this sensor As current limiter .

but . turns out this pickup strong magnet in very close distance as only on 5v or 0v ( when pickup magnet).

default 5v and when pickup magnetic field, out put 5v.

has to very close distance to sensing.

I flow the strong current about 10Amp(create short circuit) but still not pick up magnetic field.

 wrong wiring damage step module, 

Found P mosfet blown possibly short circuit on P-mosfet output with ground.

First I thought N-mosfet blown ,, But later found P-mosfet is the one.