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We present new multi-broadband transit photometry of HD 189733b obtained atthe Wyoming Infrared Observatory. Using an ensemble of five-band Sloan filterobservations across multiple transits we have created an "ultra-low" resolutiontransmission spectrum to discern the nature of the exoplanet atmosphere. Theobservations were taken over three transit events and total 108 u', 120 g', 120r', 110 i', and 116 z' images with an average exposure cadence of seven minutesfor an entire series. The analysis was performed with a Markov-ChainMonte-Carlo method assisted by a Gaussian processes regression model. We findthe apparent planet radius to increase from 0.154 +0.000920-0.00096 R* atz'-band to 0.157 +0.00074-0.00078 R* at u'-band. Whether this apparent radiusimplies an enhanced Rayleigh scattering or clear or grey planet atmosphere ishighly dependent on stellar spot modeling assumptions, but our results areconsistent with the literature for HD 189733b. This set of observationsdemonstrates the ability of our 2.3-m ground-based observatory to measureatmospheres of large exoplanets.

A Transmission Spectrum Of HD 189733b From Multiple Broadband Filter Observations