How to use If Else statement in param.asInt?

[PeteKnight]

First of all, you shouldn’t be using delays in your Blynk code. Delays block all code execution during the delay period and so in effect they cut the device off from Blynk during this period, making it unresponsive during the delay period. If your delays are long enough then the Blynk server will think the device is MIA and mark it as offline, and the device itself will go offline when it hasn’t heard from the Blynk server.

Also, you’re using 38400 baud for communication with your ESP-01 using a SoftwareSerial ’virtual’ COM port. Your Uno doesn’t have enough processing power to consistently emulate a COM port at this baud rate.

On to your issue…
The BLYNK_WRITE(vPin) callbacks are only triggered when the value of the virtual pin changes on the server, so in Auto mode there is no looping process that takes readings and compares them to your target value and takes the appropriate action based on this info.
To get around this you need to create a timed process using BlynkTimer which called your automatic code, maybe once every 5 seconds. This timed function should start by doing a check to see if your device is in Auto or a Manual mode. To achieve this, your auto/manual switch simply needs to set a global variable to the appropriate value.

Reading material…

Using timers to call a function…

Keep your void loop() clean

Option to use Timeout Timers if a delay() equivalent is needed, and discussion on auto/manual mode…

Using BlynkTimer or SimpleTimer

Many users seem to struggle with the basic concepts of using BlynkTimer in their projects, despite the excellent discussions and tutorials that exist on this forum, so I thought I’d write a guide that will hopefully help clarify things. It’s rather long, as it attempts to explain the reasoning behind why and how we use timers, and covers some more advanced subjects, but I’ve tried to organise it in a way that helps people to find answers to specific questions… Why use a timer at all? Let’s say …

Info on baud rates when using SoftwareSerial…

Understanding hardware and software serial ports

I’m still seeing frequent posts, mostly from new members of the forum, who are confused about how to add WiFi or Bluetooth connectivity to devices like the Arduino Uno, Nano or Mega, or from people who are trying to use serial communication with some other type of peripheral. I thought I’d try to put together some guidance on how to do this properly. First things first though – if you’re using a device such as an Uno, Nano or Mega that doesn’t have built-in internet connectivity then you shoul…

Also, if you’re using one of the paid subscriptions then you might want to think about using the Segmented Switch widget to give you auto/manual on/manual off settings with a single switch.

Pete.