Simple Greenhouse Temperature Regulator Circuit

该帖子讨论了一个简单的电子温度调节器电路，该电路可专门用于调节温室温度。狮子座先生要求这个想法。

技术规格

I am looking for a guide to build a basic temp regulator circuit. I have a solar charger bought from lidl,(SLS 2200 A1) which has outputs for 5, 7.5 & 9.5v DC 0.5A. it will be used for soil heating in a greenhouse.

我的想法是将黑色滴灌管用作“太阳能电池板”来加热水，并用低容量的泵调节在传播托盘下的温度。任何建议将不胜感激。

I have seen similar setups for egg incubators , fridge temp controls, etc. but need it at an allotment, so only power source is small panel. also if possible would it be possible to increase capacity of internal battery and have a heating element added.

再次感谢。

Leo

Introduction

在进入主电路概念之前，要了解上述请求中表达的一些参数，如下所示：

What is "black" drip irrigation:

我们所有人都可能听说过很多关于滴灌的信息，这种方法通过狭窄的管道线网络将水喂入整个田地的农作物中，允许水直接滴在作物茎的底部持续的时间。该方法有助于节省水，并使水到达关键区域，例如作物的根部，从而提高生长和效率。

Here an identical approach is implemented but the conventional pipes are replaced with black coiled PVC pipes. The back coiled pipe helps to absorb the heat from the sun rays naturally and allow the water passing through it to become warm naturally without depending on costly artificial utility electricity. The warm water ultimately helps to heat up the soil deep inside for acquiring the intended greenhouse effects.

What's a Propagation Tray:

These could be arrays of plastic plantation pots arranged in a large tray like fashion for allowing deeper soil content to the seedlings over minimal spaces, it's specifically designed for optimizing indoor plantations.

What's Allotment：

It may refer to a small garden or a plot of land as explained here:

https://en.wikipedia.org/wiki/Allotment_%28gardening%29

的苍井空r Panel: The specified solar panel is a self contained unit which includes a solar panel with outputs at 5,
7.5＆9.5V DC（0.5A）。它还包括一个四步充电指示器电路，最有趣的是，它包括一个内置的2200mAh锂离子电池，因此您不必费心外部电池集成，而是能够在阴天条件下使用现有的设施。

温室效应的基本要求

现在，让我们回到拟议的温室温度调节器电路的实际需求，这里的想法是将土壤温度升高到大气温度以上的10至20摄氏度，以增强或增强种子发芽。

因为种子通常在比大气温暖的土壤中发芽更快，这反过来又导致最初的根部发育而不是更大的叶片发育。

Generally, heat mats are used below the propagation trays for heating the soil but in the present application the drip water is itself heated and used for generating the same results, which looks much impressive, since heat mats could at times get messy causing sparks, fire or over heating of the soil (if the attached thermostat fails).

Nevertheless, the electronic temperature controller circuit discussed below could be used with any heating system, including heat mats.

在拟议的设计中，黑色管道内的水的自然加热得到了外部加热元件的帮助，直到水的温度达到最佳点为止。一旦感觉到这个阈值，加热器就会被调节器电路关闭，并保持在该位置，直到温度降至相对较冷的水平。

Parts List

D1 = 1N4148,

A1---A3 = 3/4 LM324,

Opto = 4N35

Circuit Operation

参考上面的图表实际上是一个简单的温度控制器电路，可以很好地用于调节拟议的温室应用中的土壤温度。

Here the temperature sensor D1 is our very own "garden" diode (no pun intended ) 1N4148 which translates every one degree (C) rise in the ambient temperature into a 2mV drop across itself.

The opamp A2 is specifically arranged to detect this change in voltage across D1 and feed the difference to A3 such that the result illuminates the LED inside the attached opto coupler IC.

可以在P1的帮助下预设上述动作的阈值。

The output of the opto is connected with a NPN driver stage which is responsible for switching off the heater as soon as the above threshold is reached.

The sensor and the heater may be placed across any desired position, as per the user preference. For example the heater could be positioned below the propagation tray, or inside the water tank from where the water is being supplied to the black pipes.

在同一地面上，传感器可以放置在周围的任何地方，可能位于繁殖托盘下方，土壤内，管道内部或简单的水箱内。

只需使用较高的额定太阳能电池板，并用较高的额定MOSFET替换TIP122，就可以根据应用程序升级该设备的容量。加热器也可以根据要求升级。