Effective an IoT-Based Arduino Design for Automated Bioreactor Control and Sample Collection in Biobutanol Production

A successful automatic control was developed using Arduino and ESP32 microcontrollers to operate a low-cost prototype bioreactor, which resulted in the effective production of biobutanol. The system maintained a temperature of 30.70 °C, an average pH of 6.61, and effectively reduced oxygen levels to 0% v/v within 130 seconds. The highest cell concentration was 1.26 × 10
⁸
CFU/ml, and GC-FID analysis showed acetone, butanol, and ethanol concentrations of 0.3925, 0.05304, and 1.1184 g/L, respectively. In addition, a sample collector was designed to collect samples with a precision of 10±1 ml and a time deviation of 2±13 seconds. In terms of the cloud system, NETPIE was used for device management. It can effectively display real-time conditions and control equipment as required. Google Sheets collected 43,200 data points for each parameter for data analysis and observation. Moreover, the Line application was applied for message notification when a sample was collected. The cost of the automated prototype bioreactor was 1093.61 USD for a 10 L production volume, and the automated sample was 210.99 USD for 24 tubes, with a maximum volume capacity of 15 ml. Therefore, both the automated bioreactor and the sample collector system were effective for control and monitoring, contributing to improving the biobutanol production process.