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| − | <img src="https://lh3.googleusercontent.com/E5PXlc-QefqGRQmrMPkoalrb_B8vf42TaayGBEogfYbLonzRza8N4oakbWr8pK52lcb5oJ2lfikhj9CLiS6-E0T5XimLPVwQjJxabvH9G9An6Gktmehd8OxNSPDirKnUfU0f7aHYLUwPYBQRAiS4FhYclKXm1j6EEAf8n1uYQcfVLbjGlHlaPR_AM0ZpcyhT-MXe-RoQuBS1xKG-K9ALU8UNMiD2s2pfZ-69YRumo0YD_UeXOyn6Kiy3-2WlVMUX0j0dwsRH9QddFFsdJcGOpXJdluN8JFAlp0WV6qgMbNG5jFGw5mTeMeGX12_ZaiKnVquog8sgUJWej7BYKVC8NaIhVH6acU0kGvnUDvtrUzazZWLxJf_XTXolt_0eSMPVYFVVgUtJSVUP_bobpbxO1iIwSUgvNqauHkJMwW51Yjl3nog-RUtYasrieWrxsC8mRVFsH0IkuPKyplclMt8NL_Q2s6BsEVWi5a1TZRgLZaPFjdQnINgbugIPJQ6SsXr0ipnCvDpTtkZBIBT4qGe3MI_Qstr-hw-9GF9Db9pUsDboJ3KoIQ2YgUeYkJEMM5n7aPqAuk0SYT9xrsyKI8kNOoOZKFBGQCl9MWQIpeVs6njzg7m_=w426-h510-no" class="img-responsive" id="detail-image" />
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| − | </section>
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| − | <section class="content col-xs-offset-5 col-xs-7">
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| − | <section id="no-highlight">
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| − | <h3>Overview </h3>
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| − | <p> An experimental setup to monitor and control the humidity and temperature of a container is developed (Figure 1). The different hardware components will be elaborately discussed in what follows.</p>
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| − | <section id="sensor-highlight">
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| − | <h3>Sensors </h3>
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| − | <p> Combined humidity/temperature Sensor In order to quantify the environmental conditions as good as possible, a combined humidity/temperature sensor is used to gather this information. Two different sensors are tested for this project, the DHT11 and
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| − | DHT22 sensor. Both sensors are similar but the DHT22 provides a better accuracy and a larger measuring range. The humidity is sensed with a polymer that changes conductivity with the humidity and the temperature is obtained via a basic thermistor.
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| − | This basic design makes these sensors both accurate and low cost. The measurements are transmitted to a Raspberry Pi microprocessor via an 1-wire communication protocol [2].
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| − | </p>
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| − | <section id="humidifier-highlight">
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| − | <h3>Humidifier </h3>
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| − | <p> The humidity is controlled with an ultrasound air humidifier which disperses an ultra-fine mist of water droplets in the air to increase the humidity. This mist is directed via PVC piping to the actual container that holds the Dewpal collectors. This
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| − | piping gives time for the droplets to evaporate and add to the humidity.</p>
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| − | </section>
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| − | <section id="relay-highlight">
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| − | <h3>Relay module </h3>
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| − | <p> The humidifier is constructed for manual control and in order for the controller to actuate this humidifier, a relay module is used to disconnect the humidifier from the power supply when the desired humidity is reached. This electrically operated
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| − | switch receives a low voltage signal from a Raspberry Pi microprocessor and closes the higher voltage circuit powering the humidifier.</p>
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| − | </section>
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| − | <section id="microprocessor-highlight">
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| − | <h3>Microprocessor</h3>
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| − | <p> At the heart of our do-it-yourself humidistat lies the Raspberry Pi microprocessor. This microprocessor performs a handful of task; at the software side it executes a closed-loop control algorithm to control the humidity of the humidistat and writes
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| − | the temperature, humidity and humidifier actions to CSV files for further analysis. On the hardware side of the it communicates with the sensor and actuates the relay module. </p>
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| − | </section>
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| − | <section id="housing-highlight">
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| − | <p> Housing </p>
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| − | </section>
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| | <h2>Hardware</h2> | | <h2>Hardware</h2> |
| | <p>Under construction.</p> | | <p>Under construction.</p> |
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