The GPIO on the mangOH IoT connector are not fast enough to directly control a Dallas/Maxim 1-wire device. For my demo a couple of years ago I built a prototype IoT card that had a I2C to 1-wire bridge chip on it and wrote some code to read multiple, parasite powered DS18x20 temperature sensors.
I didn’t think there was much interest in the IoT card so I didn’t go any further towards commercialising it.
What interface are you using for the SSD1306 display? I’ve used SPI and GPIOs to drive a black and white Nokia 5110 style display I got from Sparkfun. You could probably bolt this onto the end of one of my IoT breakout cards that are available from Linkwave (http://ecommerce.linkwave.co.uk/iot-connector-i2c-spi-gpio-uart/)