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.

EBP / ABS TRAILER POWER TESTER

making 24 to 12v step down power supply.

LM2596 is only supply max 3A. and 

even 3A is became too hot 

so instead of LM2596, I tried to make power supply using same principle like LM2596, 

using inductor and capacitor with maxium pwm speed of AT328p 4Mhz. 

faster then LM2596, so if i using right inductor and capacitor , then can make power supply using 30-50A mosfet. I successfuly create 4Mhz pwm using ARDUINO, and then when I using pulse signal 5v to make amplifed 12volt to control MOSFET. but signal became flat... I think, none of transistor or optocoupler, is not fast enough to fallow speed in my hand .I am not sure exist one. so last trried,  I connect to LM2596 output signal to mosfet Gate pin, Mosfet is not fast enough as well..

So far I fail.

but I tried to make LM2596 - 12v fixed one 

But I can not make  3-5 paralle circuit to make power supply 24 to 12v .../.

will not even power load on LM2596 , possibly burn one LM2596 first.

but first have to test and LM2596 need to precies.