arduino - Reason for Using potentiometer to connect LCD -


why should connect potentiometer pin 3 of (16*2) lcd instead of directly connecting 1 of pins in arduino , use analog write write optimum value?

the potentiometer used change contrast. can try remember analogwrite() uses pwm write analog value. replacing continuous voltage value discrete value, frequency slow , lcd may flick.


Comments

Post a Comment

Popular posts from this blog

android - ConstraintLayout: Realign baseline constraint in case if dependent view visibility was set to GONE -

Image
is there way realign baseline constraint textview in case if dependent view visibility set gone? my layout code: <android.support.constraint.constraintlayout android:layout_width="match_parent" android:layout_height="wrap_content"> <textview android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="test title" android:textcolor="@color/black" android:textsize="24sp" app:layout_constraintleft_toleftof="parent" app:layout_constraintright_torightof="parent"/> <textview android:id="@+id/subtitle1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="subtitle 1" android:textsize="11sp" app:layout_constraintb...
Read more

Retrieving ETA (estimated time of arrival) with Google Distance Matrix API and public transit as transport mode -

Image
is possible retrieve eta google's distancematrix api (or alternative api). fyi, eta different duration, when using public transport. following example clarify request. when leave on friday @ 8.15 i'll able catch train @ 8.30 , arrive @ 9.00 am. google says duration 30 minutes. however, when leave on saturday @ 8.15 i'll able catch first train @ 9.00 , arrive @ 9.30 am. google still says duration 30 minutes, means ignore delay. google map supports functionality there api around giving me eta instead of duration. can see, distance-matrix' response no good. clarifying question little. eta estimated time of arrival , it's clear user wants know entire duration of transport (including waiting time public transport).
Read more

How to put a lock and transaction on table using spring 4 or above using jdbcTemplate and annotations like @Transactional? -

i trying put lock on table while writing on table , if happened in between roll-back . trying convert below code lock table test_g1 read; lock table test_g write; -- begin; start transaction; insert test_g1 values(143); insert test_g values(145); select * test_g1; select * test_g; rollback; select * test_g; unlock tables; how convert above code @transactional spring jdbctemplate code? @transactional(rollbackfor={dataaccessexception.class}) public void test(){ jdbctemplate.execute("insert test1 (id, nam) values (4, 'a')"); throw new dataaccessexception("error") { }; } here trying throw error, insert statement should rollback it's not happening . thanks edit-1 attaching code , doing in jdbcdaoimpl.java , mentioned problem comment above test() . app.java package com.cgiri.javabrains.spring4; import org.springframework.beans.factory.annotation.autowired; import org.springframework.context.applic...
Read more