Marcus Povey
You know you may be overthinking this whole homebrew thing when : http://www.amazon.co.uk/DS18B20-1-Wire-Digital-Thermometer-Dallas/dp/B00AYE2T2O/ and http://www.amazon.co.uk/Vktech-DS18b20-Waterproof-Temperature-Transducer/dp/B00CHEZ250/
